APA (7th ed.) Citation

United States. Bureau of Soils & ProQuest (Firm). (1907). Field operations of Bureau of Soils, 1906, maps. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Bureau of Soils and ProQuest (Firm). Field Operations of Bureau of Soils, 1906, Maps. Washington: [publisher not identified], 1907.

MLA (9th ed.) Citation

United States. Bureau of Soils and ProQuest (Firm). Field Operations of Bureau of Soils, 1906, Maps. [publisher not identified], 1907.

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