 Inspecting a creek in Potholes Park (Fall Creek Gorge) by international students of Purdue University. Near Pine Village, Indiana, June 5, 1999.
 Potholes Park, Fall Creek Gorge. The trip was organized by Purdue University International Center. Near Pine Village, Indiana, June 5, 1999.
 Overcoming a tub in a creek in Potholes Park (Fall Creek Gorge) by an international student of Purdue University. Near Pine Village, Indiana, June 5, 1999.
 Canoe trip on Tippecanoe River with international students of Purdue University. Indiana, September 18, 1999.
 Students walking between Engineering Center and Engineering Laboratories. Purdue University, West Lafayette IN, January 6, 1999.
 A trip to Mount Baldy on Lake Michigan in Indiana with international students, July 17, 1999.
 S.-w. side of Purdue Mall, view from Electrical Engineering Building. Purdue University, West Lafayette, Indiana, October 29, 1999.
 Purdue Mall, the fountain, and Hall of Administration, view from Electrical Engineering Building. Purdue University, West Lafayette, Indiana, October 29, 1999.
 Remains of a fan (?) and books after a fire in the theoretical chemistry lab of Purdue University at Memorial Day. West Lafayette, Indiana, June 1, 1999.
 Burned part of the theoretical chemistry lab (there was a bookshelf) after a fire at Memorial Day. Purdue University, West Lafayette, Indiana, June 1, 1999.
 A burned desk in the theoretical chemistry lab (there was a coffee pot?) after a fire at Memorial Day. Purdue University, West Lafayette, Indiana, June 1, 1999.
 Founders Park in Purdue University. West Lafayette, Indiana, September 21, 1999.
 Purdue University Mall. West Lafayette, Indiana, October 10, 1999.
 Purdue Mall and Administration Hall at Purdue University, West Lafayette IN, 20 June, 1999.
 Fountain of Purdue Mall and Bell Tower at Purdue University, West Lafayette IN, 20 June, 1999.
 Fountain of Purdue University Mall. West Lafayette, Indiana, September 21, 1999.
 Purdue University Mall during afternoon hours. West Lafayette, Indiana, September 21, 1999.
 Purdue University Mall and Electrical Engineering Building. West Lafayette, Indiana, September 26, 1999.
 View of Purdue University Mall from the second floor of Electrical Engineering Building. West Lafayette, Indiana, September 21, 1999.
 A grey squirrel gnawing a nut on its home range near Mechanical Engineering Building. Purdue University, West Lafayette, Indiana, October 1, 1999.
 Founders Park at Purdue University, West Lafayette IN, 20 June, 1999.
 Fountain near John Purdue grave, Purdue University, West Lafayette IN, January 3, 1999.
 A lecture of Sabre Kais Phase transitions and critical phenomena for electronic structure of atoms and molecules (?) at internal meeting of the quantum chemistry group of Purdue University. West Lafayette, Indiana, September 21, 1999.
 Pablo Nigra, Qicun Shi, Stephen Belair, Imad Ladadwa and Ricardo A. Sauerwein ready to listen a lecture of S. Kais at internal meeting of the quantum chemistry group of Purdue University. West Lafayette, Indiana, September 21, 1999.
 Quantum chemistry group of Purdue University (Qicun Shi, Pablo Nigra, Jack Yang, Stephen Belair, Sabre Kais, Aaron Stanton) in front of "King Buffet" restaurant after $8 seafood dinner. Lafayette, Indiana, April 30, 1999.
 Brown Laboratories of Chemistry at Purdue University, West Lafayette IN, 21 June, 1999.
 Wetherill Laboratory of Chemistry at Purdue University, West Lafayette IN, 20 June, 1999.
 Qicun Shi explains to Sabre Kais correlation effects in scattering of an electron on lithium-like atom with a variable nuclear charge slightly above two after a lecture of Imad Ladadwa about ionization cross sections at internal meeting of the quantum chemistry group. Purdue University, West Lafayette, Indiana, October 1, 1999.
 Sabre Kais and Qicun Shi discuss electronic shell structure and correlations in scattering of an electron on lithium-like atom with a variable nuclear charge slightly above two after a lecture of Imad Ladadwa about ionization cross sections at internal meeting of the quantum chemistry group. Purdue University, West Lafayette, Indiana, October 1, 1999.
 Late fall in Happy Hollow Park. West Lafayette, Indiana, October 27, 1999.
 Fall colors in Happy Hollow Park. West Lafayette, Indiana, October 27, 1999.
 Fall colors in Happy Hollow Park. West Lafayette, Indiana, October 27, 1999.
 Fountain of Purdue University Mall. West Lafayette, Indiana, March 10, 1998.
 Purdue University Mall and Bell Tower. West Lafayette, Indiana, February 27, 1998.
 Purdue University Hall and Recitation Building. West Lafayette, Indiana, March 10, 1998.
 Purdue University Mall. West Lafayette IN, January 3, 1999.
 - Christmas party for international students 12/5/97 (Dallas, December 1 - 6, 1997)
 Purdue University Memorial Union from State Street. West Lafayette, Indiana, March 10, 1998.
 - Final banquet at Midwest Theoretical Chemistry Conference in Purdue University 5/23/98 (Indiana and Lafayette, May 15 - 24, 1998)
 - Final banquet at Midwest Theoretical Chemistry Conference in Purdue University 5/23/98 (Indiana and Lafayette, May 15 - 24, 1998)
 - Final banquet at Midwest Theoretical Chemistry Conference in Purdue University 5/23/98 (Indiana and Lafayette, May 15 - 24, 1998)
 - Final banquet at Midwest Theoretical Chemistry Conference in Purdue University 5/23/98 (Indiana and Lafayette, May 15 - 24, 1998)
 - Final banquet at Midwest Theoretical Chemistry Conference in Purdue University 5/23/98 (Indiana and Lafayette, May 15 - 24, 1998)
 - Purdue University 1/3/99 (West Lafayette, November 26, 1998 - January 3, 1999)
 Purdue University, Administration Hall. West Lafayette IN, January 3, 1999.
 - Purdue University 1/3/99 (West Lafayette, November 26, 1998 - January 3, 1999)
 - Purdue University 1/3/99 (West Lafayette, November 26, 1998 - January 3, 1999)
 - Purdue University 1/3/99 (West Lafayette, November 26, 1998 - January 3, 1999)
 - Purdue University 1/3/99 (West Lafayette, November 26, 1998 - January 3, 1999)
 Wetherill Laboratory of Chemistry at Purdue University. West Lafayette IN, January 3, 1999.
 Pine forest on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Pine Hills Park in Indiana, July 24, 1999. Honeycomb wall.
 Frozen ornamental cabbage at Centennial Mall. Purdue University, West Lafayette IN, January 6, 1999.
 View of Nuclear Engineering Building from the lab at the Dept. of Chemistry. Purdue University, West Lafayette IN, January 6, 1999.
 Pablo Serra and Huan Pablo Neirotti at a dinner in a restaurant near Purdue University. West Lafayette, Indiana, February 26, 1998.
 Burnett Creek down Tippecanoe Battlefield Park. Indiana, November 26, 1999
 Jack Yang, Stephen Belair and Pablo Nigra in the lab of the Department of Chemistry (a little white fan later 5/31/99 caused a fire). Purdue University, West Lafayette IN, January 6, 1999.
 Log Chapel at the University of Notre Dame. South Bend, Indiana, May 21, 1999.
 A squirrel on a lawn of the University of Notre Dame. South Bend, Indiana, May 21, 1999.
 Catholic cemetery at the University of Notre Dame. South Bend, Indiana, May 21, 1999.
 Catholic cemetery at the University of Notre Dame. South Bend, Indiana, May 21, 1999.
 A squirrel near Residence Halls at the University of Notre Dame. South Bend, Indiana, May 21, 1999.
 Basilica of the Sacred Heart at a catholic University of Notre Dame. South Bend, Indiana, May 21, 1999.
 Golden Dome (administration building) at the University of Notre Dame. South Bend, Indiana, May 21, 1999.
 History of pioneers of Indiana presented in Adams Mill, with a running water outlet. Indiana, May 15, 1999.
 Burnett Creek near Battle Ground. Indiana, October 16, 1999.
 Burnett Creek near Davis Ferry Bridge. Indiana, November 26, 1999
 "Indiana" Entertainment Center opposite to Akademicheskaya subway station (Russians believe that the state of Indiana is still inhabited by American Indians). Saint Petersburg, Russia, April 21, 1999.
 Burnett Creek during dry weather near Battle Ground, north from Lafayette. Indiana, September 11, 1999.
 Ducks in Saint Mary s Lake reflecting Golden Dome and Basilica of the Sacred Heart at the University of Notre Dame. South Bend, Indiana, May 21, 1999.
 Purdue Memorial Union (student services). West Lafayette, Indiana, February 27, 1998.
 Sabre Kais and another participant of Midwest Theoretical Chemistry Conference at a lunch in Center for Continuing Education at the University of Notre Dame. South Bend, Indiana, May 21, 1999.
 A pumpkin grown in wild at Burnett Creek near Battle Ground, north from Lafayette. Indiana, September 11, 1999.
 Sabre Kais and Imad Ladadwa at a lunch during Midwest Theoretical Chemistry Conference. Center for Continuing Education at the University of Notre Dame, South Bend, Indiana, May 21, 1999.
 Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 Sheltowee Trail. Red River Gorge, Kentucky, November 6, 1999.
 A.S. on Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 A.S. on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 "Potholes" on its stem and forking gills of a milkcap mushroom Lactarius delicatus(?) in Lick Creek Park. College Station, Texas, December 27, 2021
 Forest near Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 Forest below Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
 View from Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 View of a beaver s pond from a beaver s damn across Burnett Creek. Indiana, November 26, 1999
 Happy Hollow Park. West Lafayette, Indiana, May 5, 1999.
 Oaks in Tippecanoe Battlefield Park. Indiana, November 26, 1999
 Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Flowers on a stone at Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 Mushrooms in moss at Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 Oak forest near Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from the top of Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Sheltowee Trail near Chimney Top Rock. Red River Gorge, Kentucky, November 6, 1999.
 A small maple on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
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