Annual catalogue / Pennsylvania State Normal School (Slippery Rock, Pa.).

Tal på Reformations-minnesdagen, 1875

P. E. Melin

Geologic Factors in Predicting Coal Mine Roof-rock Stability in the Upper Kittanning Coalbed, Somerset County, Pa.

Anthony T Iannacchione

Mining, Crushing, and Grinding Methods and Costs at the Reliance Cement-Rock Quarry of the Giant Portland Cement Co., Egypt, Pa.

S. McAnally