81. 1998 assessment of undiscovered deposits of gold, silver, copper, lead, and zinc in the United States / by the U.S. Geological Survey National Mineral Resource Assessment Team. U.S. Geological Survey circular ; 1178. U.S. Geological Survey National Mineral Resource Assessment Team [Reston, Virginia] : U.S. Department of the Interior, U.S. Geological Survey, 2000.[Washington, D.C.] : United States Government Printing Office, 2000. Book Online
82. Areas susceptible to irrigation-induced selenium contamination of water and biota in the western United States / by Ralph L. Seiler, Joseph P. Skorupa, and Lorri A. Peltz. U.S. Geological Survey circular ; 1180., U.S. Geological Survey Circular ; 1180 Seiler, R. L. [Reston, Virginia] : U.S. Department of the Interior, U.S. Geological Survey, 1999.[Washington, D.C.] : U.S. Government Printing Office, 1999. Book Online
83. Environmental characteristics and water quality of hydrologic benchmark stations in the United States, 1963-95. U.S. Geological Survey circular ; 1173. Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 1999-2000. Book Online
84. Estimating areas contributing recharge to wells : lessons from previous studies / by O.L. Franke [and three others]. U.S. Geological Survey circular ; 1174. Franke, O. Lehn Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 1999. Book Online
85. Land subsidence in the United States / edited by Devin Galloway, David R. Jones, S.E. Ingebritsen. U.S. Geological Survey circular ; 1182. Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 1999. Book Online
86. Open skies aerial photography of selected areas in Central America affected by Hurricane Mitch / by Bruce F. Molnia and Cheryl A. Hallam ; prepared in cooperation with the Defense Threat Reduction Agency. U.S. Geological Survey circular ; 1181. Molnia, Bruce Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 1999.Washington, D.C. : Government Printing Office, 1999. Book Online
87. The quality of our nation's waters : nutrients and pesticides / [Gregory J. Fuhrer and others]. U.S. Geological Survey circular ; 1225. Fuhrer, Gregory J. Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 1999. Book Online
88. Total materials consumption : an estimation methodology and example using lead, a materials flow analysis / by Marilyn B. Biviano, Daniel E. Sullivan, and Lorie A. Wagner. U.S. Geological Survey circular ; 1183. Biviano, Marilyn B. Denver, Colo. : U.S. Dept. of the Interior, U.S. Geological Survey ; [Washington, D.C.] : [Supt. of Docs., U.S. G.P.O., distributor], 1999. Book Online
89. Yucca Mountain as a radioactive-waste repository : a report to the director, U.S. Geological Survey / by Thomas C. Hanks [and four others]. U.S. Geological Survey circular ; 1184. Hanks, Thomas C. [Reston, Virginia] : U.S. Department of the Interior, U.S. Geological Survey, [1999?] Book Online
90. Aggregates from natural and recycled sources : economic assessments for construction applications--a materials flow analysis / by David R. Wilburn and Thomas G. Goonan. U.S. Geological Survey circular ; 1176. Wilburn, D. R. (David R.) Denver, Colo. : U.S. Dept. of the Interior, U.S. Geological Survey, 1998. Book Online
91. Crushed cement concrete substitution for construction aggregates, a materials flow analysis / by Thomas Kelly. U.S. Geological Survey circular ; 1177. Kelly, Thomas (Thomas Dudley), 1948- [Denver, Colo.] : U.S. Department of the Interior, U.S. Geological Survey, [1998] Book Online
92. Geology for a changing world : a science strategy for the Geologic Division of the U.S. Geological Survey, 2000-2010 / by Steven R. Bohlen [and nine others]. U.S. Geological Survey circular ; 1172. Bohlen, Steven R. [Reston, Virginia] : U.S. Department of the Interior, U.S. Geological Survey, 1998.Washington : United States Government Printing Office, 1998. Book Online
93. Ground water and surface water : a single resource / by Thomas C. Winter [and three others]. U.S. Geological Survey circular ; 1139. Winter, Thomas C. Denver, Colorado : U.S. Department of the Interior, U.S. Geological Survey, 1998.[Washington, D.C.] : U.S. Government Printing Office, 1998. Book Online
94. Hydrology of central Florida lakes : a primer / [Donna M. Schiffer]. U.S. Geological Survey circular ; 1137. Schiffer, Donna M. [Reston, Virginia] : U.S. Department of the Interior, U.S. Geological Survey, 1998.[Washington, D.C.] : U.S. Government Printing Office, 1998. Book Online
95. A strategy for assessing potential future changes in climate, hydrology, and vegetation in the western United States / by Robert S. Thompson [and three others]. U.S. Geological Survey circular ; 1153. Thompson, Robert Stephen [Reston, Virginia] : U.S. Department of the Interior, U.S. Geological Survey, 1998.Washington : United States Government Printing Office, 1998. Book Online
96. Water Quality in the Apalachicola-Chattahoochee-Flint River Basin, Georgia, Alabama, and Florida, 1992-95 / by Elizabeth A. Frick [and six others]. U.S. Geological Survey circular ; 1164. Frick, Elizabeth A. [Reston, Va.] : U.S. Department of the Interior, U.S. Geological Survey, 1998. Book Online
97. Water quality in the Central Columbia plateau, Washington, and Idaho, 1992-95 / by Alex K. Williamson [and five others]. U.S. Geological Survey circular ; 1144. Williamson, Alex K. [Reston, Virginia] : U.S. Department of the Interior, U.S. Geological Survey, 1998. Book Online
98. Water quality in the central Nebraska basins, Nebraska, 1992-95 / by S.A. Frenzel [and five others]. U.S. Geological Survey circular ; 1163. Frenzel, S. A. [Reston, Virginia] : U.S. Department of the Interior, U.S. Geological Survey, 1998. Book Online
99. Water quality in the Georgia-Florida coastal plain, Georgia and Florida, 1992-96 / by Marian P. Berndt [and five others]. U.S. Geological Survey circular ; 1151. Berndt, Marian P. [Reston, Virginia] : U.S. Department of the Interior, U.S. Geological Survey, 1998. Book Online
100. Water quality in the Hudson River Basin, New York and adjacent states, 1992-95 / by Gary R. Wall, Karen Riva-Murray, and Patrick J. Phillips. U.S. Geological Survey circular ; 1165. Wall, Gary R. (Gary Robert), 1967- [Reston, Virginia] : U.S. Department of the Interior, U.S. Geological Survey, 1998. Book Online