United States. Bureau of Labor Statistics & ProQuest (Firm). (1922). Hours and earnings in anthracite and bituminous coal mining. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. Bureau of Labor Statistics and ProQuest (Firm). Hours and Earnings in Anthracite and Bituminous Coal Mining. Washington: [publisher not identified], 1922.
MLA (9th ed.) CitationUnited States. Bureau of Labor Statistics and ProQuest (Firm). Hours and Earnings in Anthracite and Bituminous Coal Mining. [publisher not identified], 1922.
Warning: These citations may not always be 100% accurate.