(Documentary Artifact): One b/w photographic print of Roberto Thomson and Guillermo
Mexia standing at the rear of the San Baltazar cave. According to notes on the verso of the print, the cave is 90 to 100 ft. deep and 100 feet wide at the mouth.
Notes on verso of print:
OP 14961-188/ 88:17050-188/ 13/ B/13-7/ Mulege/ Apr. 1 1926/ Large cave Roberto + Wm. at rear/ 90 to 100 ft. deep + 100 feet wide/ at mouth