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Slide set twelve contains photos of sites related to research on Mayan measurement systems, as well as archaeological photos of the Art of Ancient Maya and Mexican gold objects. Related materials also include Mayan site plans within the respective series.

Also included in this series are slides related to research on hot springs, birds and animals, and Native American sacred sites (animal lodges, etc). Specific locations of these sites include South Dakota, Nebraska, Kansas, Oklahoma, Minnesota, Wyoming, and Montana.

This subseries is composed of photos from Pat O'Brien's travels in Peru and Bolivia. The majority of the photos feature buildings (especially churches), streets, and landscapes (especially the Andes mountain range).