Outstanding scenic geological features of Pennsylvania / Alan R. Geyer [and] William H. Bolles.Alan R. Geyer · First published 1979Open the Tome
Environmental geology for land-use planning / Alan R. Geyer, William G. McGlade.Alan R. Geyer · First published 1972Open the Tome
Geology, mineral resources, and environmental geology of the Palmyra Quadrangle, Lebanon and Dauphin Counties, by Alan R. GeyerAlan R. Geyer · First published 1970Open the Tome
Outstanding scenic geological features of PennsylvaniaAlan R. Geyer · First published 1979 · Latest edition 1987Open the Tome
Engineering characteristics of the rocks of PennsylvaniaAlan R. Geyer · First published 1982Open the Tome
Mineral Collecting in Pennsylvania, General Geology Report 33Alan R. Geyer, Robert C. Smith, John H. Barnes · First published 1976Open the Tome
Geology, mineral resources, and environmental geology of the Palmyra QuadrangleAlan R. Geyer · First published 1970Open the Tome
Geology and mineral resources of the Womelsdorf quadrangleAlan R. Geyer · First published 1963Open the Tome
Geology of the vicinity of the Hershey mine, Hershey, PennsylvaniaAlan R. Geyer, University of Michigan. Dept. of Geology and Mineralogy · First published 1956Open the Tome
![Placeholder cover for Outstanding scenic geological features of Pennsylvania / Alan R. Geyer [and] William H. Bolles.](/images/parchment.webp)
