United States. Bureau of Labor Statistics & ProQuest (Firm). (1927). Hours and earnings in bituminous coal mining 1922, 1924, and 1926. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. Bureau of Labor Statistics and ProQuest (Firm). Hours and Earnings in Bituminous Coal Mining 1922, 1924, and 1926. Washington: [publisher not identified], 1927.
MLA (9th ed.) CitationUnited States. Bureau of Labor Statistics and ProQuest (Firm). Hours and Earnings in Bituminous Coal Mining 1922, 1924, and 1926. [publisher not identified], 1927.
Warning: These citations may not always be 100% accurate.