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BLEEDER SYSTEM IN VIRGIN AREA INA A PITTSBURGH COALBED MINE.

By Krickovic,S,Moore, Jr,T D. U. S. Dept. Of The Interior, Bureau Of Mines, [S. L.] 1973 . 8 , Bounds With Usbm Ri 7801-04, 7806-7820 Lack No. 7814

By Findlay,C,Krickovic,S. U. S. Dept. Of The Interior, Bureau Of Mines, [S. L.] 1973 . 11 , Bound With Usbm Ri-7771-7789 Lack No. 7775.

U. S. Dept. Of The Interior, Bureau Of Mines, [S. L.] 1972 . 9p , RI 7651-66 Bound Vol. No.102398; Contents: TR15451-64