Não informado. (1882). Mineral resources of the United States. U.S. Geological Survey.
Style de citation Chicago (17e éd.)Não informado. Mineral Resources of the United States. Washington: U.S. Geological Survey, 1882.
Style de citation MLA (8e éd.)Não informado. Mineral Resources of the United States. U.S. Geological Survey, 1882.
Attention : ces citations peuvent ne pas être correctes à 100%.