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.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Washington (State). Division of Mines and Mining, Washington (State). Division of Mines and Geology, và 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.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Washington (State). Division of Mines and Mining, et al. Directory of Washington Mining Operations. Department of Conservation and Development, Division of Mines and Geology.