Bulletins. 507. Castleman Basin, Garrett County. Md.: 1. Investigation of field and estimated reserves of coal, by Albert L. Toenges, Lloyd Williams, and Louis A. Turnbull: 2. Petrography of coal, by B. C. Parks and H. J. O'Donnell; 3, Analyses of drill-core samples, by Roy P. Abernetliy and William H. Ode: 4, Stratigraphy of Cnstleman coal basin, by Karl M. Waage; Appendix, drill logs and chemical analyses of cores.