Slides arranged geographically, , 1958-1999, undated

Prior to August 1979, George filed slides geographically and then chronologically. Within Texas, George separated slides by region according to United States Geological Survey designations (provided in parentheses), and then ordered the regions alphabetically. For a key to the geographic regions, see Series A: Professional Papers. Roughly half of the slides in this series are documented and identified with labeling on the slide mount. A detailed finding aid and inventory of the materials in this subseries, available as an Excel spreadsheet, provides more fine-grained access to specific subjects and locations.