Geological Survey: Notes on Radium-Bearing Minerals (Classic Reprint)

Notes on Geological Map-Reading (Classic Reprint)

Geological Notes on Oil Structures (Classic Reprint)

Geological Survey Notes on RadiumBearing Minerals

Economic Geological Survey (Classic Reprint)

Geological and Archaeological Notes on Orangia (Classic Reprint)

Annual Report on the Geological Survey of Pennsylvania (Classic Reprint)

Geological and Archaeological Notes on Orangia (Classic Reprint)