This sub-series contains Bartle's map sets, groupings of records from Bartle's oil and gas exploration work. The map sets are generally grouped based on location. While these files were labelled as map sets, this name is somewhat misleading, since the sets include correspondence, drilling data, and reports in addition to maps.

This sub-series contains files related to Bartle's employment and consulting in oil and gas exploration. Files include correspondence, reports, maps, data, and photographs of drilling sites. Additional files about oil and gas exploration can be found in the map sets sub-series.

This sub-series contains Bartle's map sets, groupings of records from Bartle's oil and gas exploration work. The map sets are generally grouped based on location. While these files were labelled as map sets, this name is somewhat misleading, since the sets include correspondence, drilling data, and reports in addition to maps.

This sub-series contains Bartle's map sets, groupings of records from Bartle's oil and gas exploration work. The map sets are generally grouped based on location. While these files were labelled as map sets, this name is somewhat misleading, since the sets include correspondence, drilling data, and reports in addition to maps.

This sub-series contains Bartle's map sets, groupings of records from Bartle's oil and gas exploration work. The map sets are generally grouped based on location. While these files were labelled as map sets, this name is somewhat misleading, since the sets include correspondence, drilling data, and reports in addition to maps.