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Displaying 1-6 of 6 results for author "Luepke, Gretchen."
Occurrence of platinum in a black sand from a beach deposit in San Mateo County, California [microform] / by Gretchen Luepke and Norman M. Maher.
- Text
- Menlo Park, CA : U.S. Geological Survey : [Denver, Colo. : Books and Open-File Reports Section, distributor], 1991.
- 1991
Sand-sized heavy-mineral distributions in the Rio Cibuco system and adjacent rivers of north-central Puerto Rico [microform] / by Gretchen Luepke and Lawrence J. Poppe.
- Text
- [Menlo Park, Calif.] : U.S. Dept. of the Interior, U.S. Geological Survey ; [Denver, Colo. : Books and Open-File Reports Section, distributor], 1993.
- 1993
Economic heavy minerals in glaciofluvial sediments of Minnesota [microform] / by Gretchen Luepke.
- Text
- Menlo Park, Calif. : U.S. Dept. of the Interior, U.S. Geological Survey ; [Denver, Colo. : Books and Open-File Reports Section, distributor], 1993.
- 1993
Sand-sized heavy-mineral distributions in offshore insular shelf sediments of north-central Puerto Rico [microform] / by Gretchen Luepke and Lawrence J. Poppe.
- Text
- Menlo Park, Calif. : U.S. Dept. of the Interior, U.S. Geological Survey ; [Denver, Colo. : Books and Open-File Reports Section, distributor], 1993.
- 1993
Variations in titanium and chromium concentrations in magnetite separates from beach and offshore sediments, San Francisco and San Mateo counties, California. Part A [microform] / by Gretchen Luepke.
- Text
- Menlo Park, Calif. : U.S. Dept. of the Interior, U.S. Geological Survey, 1994.
- 1994
Heavy minerals from cores in a deep-sea channel off Cape Mendocino, California [microform] / by Gretchen Luepke.
- Text
- [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 1995.
- 1995
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