| 作者 | D. A. O'Keefe / Donald E. Kirby / Fun-Den Wang / J. E. Dooley / John M. Gomes / Karl C. Dean / L. C. Headley / Lester J. Crow / Noel N. Moebs / Richard A. Dick / Robert Lynn Crosby / Tedford C. Briggs / United States. Bureau of Mines. Staff, Coal Sampling and Inspection / Victor R. Spironello / C. I. Pierce / Donald H. Desy / Dwight E. Couch / Eben L. Singleton / H. Austin Tucker / Joseph W. Sterner / Kenji Uchida / Meng-Cherng Sun / Robert C. Bates / Ronald F. Kendall / Donald E. Hirsch / Morton Min Wong / Robert M. Doerr / Thomas A. Sullivan / W. K. Sawyer / William C. Hill |
