APA (7th ed.) Citation

Geological Survey (U.S.) & ProQuest (Firm). Department of the Interior. United States Geological Survey. Charles D. Walcott, Director. Results of spirit leveling in Pennsylvania for the years 1899 to 1905. [publisher not identified].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). Department of the Interior. United States Geological Survey. Charles D. Walcott, Director. Results of Spirit Leveling in Pennsylvania for the Years 1899 to 1905. Washington: [publisher not identified].

MLA (9th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). Department of the Interior. United States Geological Survey. Charles D. Walcott, Director. Results of Spirit Leveling in Pennsylvania for the Years 1899 to 1905. [publisher not identified].

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