APA (7th ed.) Citation

Wyoming Geological Association. Nomenclature Committee. [Penetration charts]. [publisher not identified].

Chicago Style (17th ed.) Citation

Wyoming Geological Association. Nomenclature Committee. [Penetration Charts]. [Casper, Wyo.?]: [publisher not identified].

MLA (9th ed.) Citation

Wyoming Geological Association. Nomenclature Committee. [Penetration Charts]. [publisher not identified].

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