APA (7th ed.) Citation

Oregon. Department of Geology and Mineral Industries, Western Guide Publishers, & Preston, R. N. (1975). Oregon gold & gems maps: Then & now. Western Guide Publishers.

Chicago Style (17th ed.) Citation

Oregon. Department of Geology and Mineral Industries, Western Guide Publishers, and Ralph N. Preston. Oregon Gold & Gems Maps: Then & Now. Corvallis [Or.]: Western Guide Publishers, 1975.

MLA (8th ed.) Citation

Oregon. Department of Geology and Mineral Industries, et al. Oregon Gold & Gems Maps: Then & Now. Western Guide Publishers, 1975.

Warning: These citations may not always be 100% accurate.