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1.	Clay mineralogy of sediments from the Rio Cibuco system and the adjacent rivers and insular shelf on north-central Puerto Rico [microform] / by P[...] Poppe, Lawrence J.; Commeau, Judith A.; Luepke, Gretchen.; Geological Survey (U.S.) [Reston, VA] : U.S. Dept. of the Interior, Geological Survey ; [Denver, Colo. : Books and Open-File Reports Section, distributor], 1991. I 19.76: 91-628 \| Detailed record - Similar records
2.	Economic analysis of heavy minerals in sediments / edited by Gretchen Luepke. Luepke, Gretchen. New York, N.Y. : Van Nostrand Reinhold, c1985. QE364.2.H4 E26 1985 \| Map It \| Detailed record - Similar records
3.	Economic heavy minerals in glaciofluvial sediments of Minnesota [microform] / by Gretchen Luepke. Luepke, Gretchen.; Geological Survey (U.S.) Menlo Park, Calif. : U.S. Dept. of the Interior, U.S. Geological Survey ; [Denver, Colo. : Books and Open-File Reports Section, distributor], 1993. I 19.76: 93-345 \| Detailed record - Similar records
4.	Heavy minerals from cores in a deep-sea channel off Cape Mendocino, California [microform] / by Gretchen Luepke. Luepke, Gretchen.; Geological Survey (U.S.) [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 1995. I 19.76: 95-587 \| Detailed record - Similar records
5.	Mineralogical and geochemical analyses of three paleosols from the Merced Formation, near San Francisco, California [microform] / by Gretchen Lue[...] Luepke, Gretchen.; Geological Survey (U.S.) [Menlo Park, CA] : U.S. Geological Survey, 1991. I 19.76: 91-104 \| Detailed record - Similar records
6.	Occurrence of platinum in a black sand from a beach deposit in San Mateo County, California [microform] / by Gretchen Luepke and Norman M. Maher. Luepke, Gretchen.; Maher, Norman M.; Geological Survey (U.S.) Menlo Park, CA : U.S. Geological Survey : [Denver, Colo. : Books and Open-File Reports Section, distributor], 1991. I 19.76: 91-308 \| Detailed record - Similar records
7.	Sand-sized heavy-mineral distributions in offshore insular shelf sediments of north-central Puerto Rico [microform] / by Gretchen Luepke and Lawr[...] Luepke, Gretchen.; Poppe, Lawrence J.; Geological Survey (U.S.) Menlo Park, Calif. : U.S. Dept. of the Interior, U.S. Geological Survey ; [Denver, Colo. : Books and Open-File Reports Section, distributor], 1993. I 19.76: 93-341 \| Detailed record - Similar records
8.	Sand-sized heavy-mineral distributions in the Rio Cibuco system and adjacent rivers of north-central Puerto Rico [microform] / by Gretchen Luepke[...] Luepke, Gretchen.; Poppe, Lawrence J.; Geological Survey (U.S.) [Menlo Park, Calif.] : U.S. Dept. of the Interior, U.S. Geological Survey ; [Denver, Colo. : Books and Open-File Reports Section, distributor], 1993. I 19.76: 92-703 \| Detailed record - Similar records
9.	Variations in titanium and chromium concentrations in magnetite separates from beach and offshore sediments, San Francisco and San Mateo counties[...] Luepke, Gretchen.; Geological Survey (U.S.) Menlo Park, Calif. : U.S. Dept. of the Interior, U.S. Geological Survey, 1994. I 19.76: 95-15 \| Detailed record - Similar records

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