Results: 1 - 2 of 2
Jan 01, 1944
Report
… with time so that coal is a mineral product, which is always … the same age. … Stansfield, E. … Lang, W.A. … Stansfield, E. and Lang, …
Aug 31, 1957
Information Series
… formations for the industry. A second function, and one whose … research effort is required. … Lang, W.A. … Whittaker, W.C. … Mifflen, …