The Permian or Upper Carboniferous Flora - Of West Virginia and S.W. Pennsylvania is an unchanged...

This scarce antiquarian book is a facsimile reprint of the original. Due to its age, it may conta...

Reprint of the original, first published in 1882. The Antigonos publishing house specialises in t...

Reprint of the original, first published in 1882. The Antigonos publishing house specialises in t...

Reprint of the original, first published in 1883. The Antigonos publishing house specialises in t...

Reprint of the original, first published in 1883. The Antigonos publishing house specialises in t...

The Geology of Erie and Crawford Counties

The Geology of Susquehanna County and Wayne County

Discover the ins and outs of the petroleum and natural gas industries with this detailed guide. C...

This comprehensive study of the geology of Huntingdon County, Pennsylvania, is an authoritative g...

Petroleum and Natural Gas, Precise Levels

The Geology of the Susquehanna River Region in the Six Counties of Wyoming, Lackawanna, Luzerne, ...