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BRADFORD, D. F., E. M. HEITHMAR, N. G. TALLENT-HALSELL, G. MOMPLAISIR, C. G. ROSAL, L. A. RIDDICK, AND K. E. VARNER. TEMPORAL PATTERNS OF AIRBORNE PESTICIDES IN THE HABITATE OF THE MOUNTAIN YELLOW-LEGGED FROG IN THE SOUTHERN SIERRA NEVADA. Presented at Annual Meeting of California-Nevada Amphibian Populations Task Force, Las Vegas, NV, January 18 - 20, 2007.

BRADFORD, D. F., E. M. HEITHMAR, G. MOMPLAISIR, C. G. ROSAL, N. G. TALLENT-HALSELL, L. A. RIDDICK, AND K. E. VARNER. TEMPORAL VARIATION IN PESTICIDE LEVELS IN SURFACE WATERS OF THE SOUTHERN NEVADA, CALIFORNIA. Presented at Workshop: Knowledge, Uncertainties and Research Needs in Evaluationg the Role of Pesticides in Amphibian Population Declines in California and Globally, Society for Conservation Biology, San Jose, CA, June 24, 2006.

KOPSICK, D., J. BEARDEN, K. E. VARNER, AND JOHNG LYON. USE OF RFID TO TRACK HAZARDOUS WASTE SHIPMENTS ACORSS DOMESTIC AND INTERNATIONAL BORDERS. Presented at 2006 EPA Science Forum, Washington, DC, May 16 - 18, 2006.

VARNER, K. E., D. KOPSICK, AND J. BEARDEN. USE OF RFID TO TRACK HAZARDOUS WASTE SHIPMENTS ACROSS DOMESTIC AND INTERNATIONAL BORDERS. Presented at 2006 EPA Science Forum, Washington, DC, May 16 - 18, 2006.

VARNER, K. E. USE OF RFID TO TRACK HAZARDOUS WASTE SHIPMENTS ACROSS DOMESTIC AND INTERNATIONAL BORDERS. Presented at EPCglobal US Chemical Industry Summit, Houston, TX, June 21, 2006.

JonesLepp, T AND K E. Varner. DATA PACKAGE FOR THE STATE OF SOUTH CAROLINA: ORGANOTIN ANALYSIS.

JonesLepp, T, K E. Varner, AND D T. Heggem. MONITORING DIBUTYLTIN AND TRIPHENYLTIN IN FRESH WATERS AND FISH IN THE UNITED STATES USING MICRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY/ION TRAP MASS SPECTROMETRY. ARCHIVES OF ENVIRONMENTAL CONTAMINATION & TOXICOLOGY 46(1):90-95, (2004).

Rosal, C G., L A. Riddick, E M. Heithmar, G M. Momplaisir, K E. Varner, P. L. Ferguson, D F. Bradford, AND N G. TallentHalsell. ANALYSIS OF LOW-LEVEL PESTICIDES FROM HIGH-ELEVATION LAKE WATERS BY LARGE VOLUME INJECTION GCMS. Presented at Pittsburg Conference 2003, Orlando, FL, March 13, 2003.

Rosal, C G., L A. Riddick, E M. Heithmar, G M. Momplaisir, K E. Varner, P. L. Ferguson, D F. Bradford, AND N G. TallentHalsell. ANALYSIS OF LOW-LEVEL PESTICIDES FROM HIGH-ELEVATION LAKE WATERS BY LARGE-VOLUME INJECTION GCMS. Presented at Pittsburgh Confernece on Anlytical Chemistry and Applied Spectroscopy 2003, Orlando, FL, March 9-14, 2003.

Momplaisir, G M., K E. Varner, E M. Heithmar, C G. Rosal, L A. Riddick, P. L. Ferguson, B. Gentry, D F. Bradford, AND N G. TallentHalsell. DETERMINATION OF ULTRATRACE CONCENTRATIONS OF AGRICULTURAL PESTICIDES IN WATER USING SOLID-PHASE EXTRACTION AND ANALYSIS BY GC/MS. Presented at Pittsburgh Conference on Analytical Chemistry and Applied Spectrometry, Orlando, FL, March 9-14, 2003.

Rosal, C G., L A. Riddick, G M. Momplaisir, E M. Heithmar, AND K E. Varner. PULSED SPLITLESS AND LARGE-VOLUME INJECTION IN CAPILLARY GAS CHROMATOGRAPHY MASS SPECTROMETRY FOR THE DETERMINATION OF ULTRA-TRACE LEVEL PESTICIDE RESIDUES. Presented at National Environmental Monitoring Conference 2003, Arlington, VA, July 21-24, 2003.

Varner, K E., G M. Momplaisir, N G. TallentHalsell, D F. Bradford, P. L. Ferguson, L A. Riddick, C G. Rosal, AND E M. Heithmar. THE CHALLENGE OF ACQUIRING ALPINE LARGE VOLUME LAKE WATER SAMPLES FOR ULTRA TRACE LEVEL ANALYSIS. Presented at On-Site 11th International Conference, Phoenix, AZ, January 21-24, 2003.

Bradford, D F., E M. Heithmar, C L. Cross, B. Gentry, G M. Momplaisir, M S. Nash, N G. TallentHalsell, L A. Riddick, C G. Rosal, AND K E. Varner. DISTRIBUTIONS OF AIRBORNE AGRICULTURAL CONTAMINANTS RELATIVE TO AMPHIBIAN POPULATIONS IN THE SOUTHERN SIERRA NEVADA, CA. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-01/085 (NTIS PB2002-102156), 2001.

JonesLepp, T AND K E. Varner. SPECIATION AND DETECTION OF ORGANOTINS FROM PVC PIPE BY MICRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY-ION TRAP MASS SPECTROMETRY. APPLIED ORGANOMETALLIC CHEMISTRY 15(12):933-938, (2001).

Varner, K E., T L. Jones, AND C. Eskes. DEVELOPMENT AND APPLICATION OF A MICDRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY/ION TRAP MASS SPECTROMETRY METNOD FOR THE DETECTION OF TWO SUSPECTED ENDOCRINE DISRUPTORS: DIBUTYLTIN AND TRIPHENYLTIN, IN NATURAL WATERS AND FISH TISSUE. Presented at ACS National Meeting, San Francisco, CA, March 26-31, 2000.

JonesLepp, T, K E. Varner, AND A. Mitchell. DEVELOPMENT AND APPLICATION OF A SOLID PHASE EXTRACTION AND MICRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY/ION TRAP MASS SPECTROMETRY METHOD FOR DETECTING THREE PHARAMACEUTICALS IN NATURAL WATERS. Presented at National Ground Water Association Emerging Issues Conference, Minneapolis, MN, June 7-8, 2000.

JonesLepp, T AND K E. Varner. MICRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY/ION TRAP MASS SPECTROMETRY FOR DETECTION OF DIBUTYLTIN-IN NATURAL WATERS. Presented at ACS Special Symposium "Issues in the Analysis of Environmental Disruptors", San Francisco, CA, March 26-31, 2000.

JonesLepp, T AND K E. Varner. MICRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY/ION TRAP MASS SPECTROMETRY FOR DETECTION OF TWO SUSPECTED ENDOCRINE DISRUPTORS - DIBUTYLTIN AND TRIPHENYLTIN - IN NATURAL WATERS AND FISH TISSUE. Presented at ACS Special Symposium "Issues in the Analysis of Environmental Endocrine Disruptors", San Francisco, CA, March 26-31, 2000.

JonesLepp, T, K E. Varner, M R. McDaniel, AND L A. Riddick. DETERMINATION OF ORGANOTINS IN WATER BY MICRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY ION TRAP MASS SPECTROMETRY. APPLIED ORGANOMETALLIC CHEMISTRY 13:881-889, (1999).

Varner, K E., T L. Jones, AND F. MonnetTschudi. DIBUTLYTIN MEASURED IN BRAIN TISSUE USING LIQUID CHROMATOGRAPHY ELECTROSPRAY/MASS SPECTROMETRY. Presented at ACS National Meeting, San Francisco, CA, March 26-31, 2000.

Varner, K E., T L. Jones, AND A. Mitchell. DIBUTYLTIN MEASURED IN BRAIN TISSUE LISTING U-LIQUID CHROMATOGRAPHY ELECTROSPRAY/MASS SPECTROMETRY. Presented at 1999 Pacific Conference on Chemistry and Spectroscopy/35th ACS Western Regional Meeting, Ontario, CA, October 6-8, 1999.

Eskes, C., P. Honegger, F. MonnetTschudi, T JonesLepp, AND K E. Varner. NEUOROTOXICITY OF DIBUTYLTIN IN AGGREGATING BRAIN CELL CULTURE. Congress for INVITOX, England, September 1998.

Kreamer, D. K., D. E. James, AND K E. Varner. DETERMINATION OF POLLUTANT DISTRIBUTION AND MOVEMENT BY CONTROLLED LABORATORY EXPERIMENTS. U.S. Environmental Protection Agency, Washington, DC, EPA/600/SR-97/004, 1997.

Jones, T L., K E. Varner, AND L A. Riddick. USING CE-ELECTROSPRAY-ION TRAP MASS SPECTROMETRY TO MEASURE ORGANOTINS IN AN AMBIENT ENVIRONMENT. Presented at 45th American Society for Mass Spectrometry and Allied Topics Conference, Palm Springs, CA, June 1-5, 1997.

Jones, T L., K E. Varner, AND L A. Riddick. USING U-LIQUID CHROMATOGRAPHY-ELECTROSPRAY-ION-TRAP MASS SPECTROMETRY TO MEASURE ORGANOTINS IN AN AMBIENT ENVIRONMENT. Presented at 45th American Society for Mass Spectrometry and Allied Topics Conference, Palm Springs, CA, June 1-5, 1997.