Washington (State). Division of Mines and Mining, Washington (State). Division of Mines and Geology, & Washington (State). Division of Geology and Earth Resources. Directory of Washington mining operations. Department of Conservation and Development, Division of Mines and Geology.
Style de citation Chicago (17e éd.)Washington (State). Division of Mines and Mining, Washington (State). Division of Mines and Geology, et Washington (State). Division of Geology and Earth Resources. Directory of Washington Mining Operations. Olympia, Wash.: Department of Conservation and Development, Division of Mines and Geology.
Style de citation MLA (8e éd.)Washington (State). Division of Mines and Mining, et al. Directory of Washington Mining Operations. Department of Conservation and Development, Division of Mines and Geology.