Summary report on the petroleum and natural gas resources of CanadaFrederick G. Clapp · First published 1997Open the Tome
South America big field for petroleum developmentFrederick G. Clapp · First published 1919Open the Tome
Amity folio [PennsylvaniaFrederick G. Clapp, Geological Survey (U.S.) · First published 1907Open the Tome
Economic geology of the Amity quadrangle, eastern Washington County, PennsylvaniaFrederick G. Clapp · First published 1907Open the Tome
Rogersville folio [PennsylvaniaFrederick G. Clapp, Geological Survey (U.S.) · First published 1907Open the Tome
Patoka folio, Indiana-IllinoisMyron L. Fuller, Frederick G. Clapp, Geological Survey (U.S.) · First published 1904Open the Tome
