1. Report on the geology of the Philippine Islands Author/Creator: Becker, George F. 1847-1919. (George Ferdinand) Publication/Creation: [n.p.] : U.S. Geological Survey, 1900 Resource Type: Book Access & Availability: Loading
2. Report on the geology of the Phillippine Islands Author/Creator: Becker, George F. 1847-1919. (George Ferdinand) Publication/Creation: Washington : Govt. Print. Off, 1901 Resource Type: Book Access & Availability: Loading