(Mineral industry surveys; Branch of Bituminous Coal Economics, Division of Bituminous Coal.) [Quarterly, including summary for calendar year.] Oct.-Dec. 1962 and calendar year 1962— Mar. 1963—
Notes:
(Mineral industry surveys; Branch of Bituminous Coal Economics, Division of Bituminous Coal.) [Quarterly, including summary for calendar year.] Oct.-Dec. 1962 and calendar year 1962— Mar. 1963— † Distribution Made by Issuing Office. Mines Bureau, Pittsburgh, Pa.
Availability:
† Distribution Made by Issuing Office. Mines Bureau, Pittsburgh, Pa.