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Fred A. Hildebrand

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Argentian cryptomelane and bromargyrite in volcanic rocks near Silver Cliff, Colorado

1974
- Fred A. Hildebrand
- Elwin L. Mosier
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A Breccia Dike containing Rare-Earth-Bearing Apatite, Molybdenite, and Magnetite at Iron Hill, Custer County, Colorado

1974 Economic Geology
- Fred A. Hildebrand
- Nancy M. Conklin
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Morphology and structure of endellite and halloysite

1950 American Mineralogist
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