11. Preliminary estimates of production of Pennsylvania anthracite and of beehive coke for month of Nov. 1949-May 1950, monthly preliminary estimates anthracite and beehive coke no. PCC 11-49 to PCC 5-50. Bookmark Corporate/Agency Authors: Mines Bureau and Interior Dept. Publisher: Mines Bureau SuDoc number: I 28.50:949/11-950/5
12. Preliminary estimates of production of Pennsylvania anthracite and of beehive coke, monthly preliminary estimates anthracite and beehive coke. Bookmark Corporate/Agency Authors: Mines Bureau and Interior Dept. Publisher: Mines Bureau SuDoc number: I 28.50:(date)