Craighead, S. J., Paul, J. W., & Tomlinson, H. (1931). Roof support in coal mines in Irwin, Greensburg, and Latrobe basins, Westmoreland County, Pa. [publisher not identified].
Chicago Style (17th ed.) CitationCraighead, S. J., J. W. Paul, and Herbert Tomlinson. Roof Support in Coal Mines in Irwin, Greensburg, and Latrobe Basins, Westmoreland County, Pa. Washington, D.C.: [publisher not identified], 1931.
MLA (9th ed.) CitationCraighead, S. J., et al. Roof Support in Coal Mines in Irwin, Greensburg, and Latrobe Basins, Westmoreland County, Pa. [publisher not identified], 1931.
Warning: These citations may not always be 100% accurate.