Lauck, W. J. 1. (1920). The relations between wages and production, costs prices, and profits in the anthracite mining industry. Washington: [s.n.].

Lauck, W. Jett 1879-1949. The Relations between Wages and Production, Costs Prices, and Profits in the Anthracite Mining Industry. Washington: [s.n.], 1920.

Lauck, W. Jett 1879-1949. The Relations between Wages and Production, Costs Prices, and Profits in the Anthracite Mining Industry. Washington: [s.n.], 1920.