164 resultados para To-door Survey


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Signed: J.G. Cumming ... on special duty, industrial enquiries.

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Mode of access: Internet.

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"NBS project 1101-11-5100."

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"The field study and compilation of results on which this book is based were made possible by a grant from the Milton Fund for Research, Harvard University, 1928-1929."

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Cover title.

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Reprinted from U.S. Geological Survey, Contributions to bibliography of mineral resources,