Παραπομπή APA

(1922). Mines and quarries 1919: General report and analytical tables and reports for states and selected industries. Washington, D.C: Government Printing Office.

Παραπομπή Chicago Style

Mines and Quarries 1919: General Report and Analytical Tables and Reports for States and Selected Industries. Washington, D.C: Government Printing Office, 1922.

Παραπομπή MLA

Mines and Quarries 1919: General Report and Analytical Tables and Reports for States and Selected Industries. Washington, D.C: Government Printing Office, 1922.

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