Bulletin 412: Tests of Run-of-Mine and Briqueted Coal in a Locomotive Boiler.
GPO, Washington, DC: Dept. of the Interior/US Geological Survey, 1909. 8vo. 32 pp. Light fading to wraps. Dampstain to bottom corner. Fourteen tests made at various rates of combustion. B/w diagrams and charts. Very Good Wraps (Item ID: 11509)