APA (7th ed.) Citation

Geological Survey (U.S.) & ProQuest (Firm). (1917). Professional Paper 94. Economic geology of Gilpin County and adjacent parts of Clear Creek and Boulder Counties, Colorado. [publisher not identified].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). Professional Paper 94. Economic Geology of Gilpin County and Adjacent Parts of Clear Creek and Boulder Counties, Colorado. Washington: [publisher not identified], 1917.

MLA (9th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). Professional Paper 94. Economic Geology of Gilpin County and Adjacent Parts of Clear Creek and Boulder Counties, Colorado. [publisher not identified], 1917.

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