National Geographic : 1939 Aug
THEIR PICKS AND SHOVELS ARE BRINGING TO LIGHT NEW CHAPTERS IN AMERICA'S PRE-HISTORY This is one of the three shifts of local workers who dug among the Tres Zapotes mounds. Each crew of 30 men worked three days consecutively. Standing totheright of The Society's flag are Mrs. Matthew W. Stirling, Mr. Stirling, Mrs. C. W. Weiant, Dr. Alexander Wetmore, and Dr. Weiant. The laborers have assembled for roll call. Men carrying rifles are part of the local police force.