This diary records Mr. Mason's interviews and travels between January 2 and December 30 1930. The diary shows that he met with and interviewed natural science researchers and university administrators both in the United States and Europe, and coordinated with the Rockefeller Foundation's senior staff to ensure funding of projects to a maximum number of candidates at the earliest part of the Great Depression in the United States. While the depression is never directly referenced, the diary contains a copy of the "New Mexico Tax Bulletin" of 1930, a 23-page report which provided figures, estimates, and conclusions on the size and scope of the state's bonded debt in 1930. On a separate note, more than half the diary appears to be handwritten notes penned (almost illegibly) by Mason spanning several weeks and topics.

This diary records Mr. Mason's interviews and travels between January 2, 1932 and December 29, 1933, specifically with researchers across the United States, meetings with Rockefeller Foundation fellows and university administrators, and memoranda of internal discussions among staff on Rockefeller Foundation natural science research projects around the globe. Further, Mason also traveled to Europe for a brief period of time to meet with key staff of the Paris office, including important fellows and field directors. A number of discussions recorded in the diary are concerned with the difficulties surrounding funding and maintaining research projects throughout the United States and Europe despite the depressed economic conditions.

This diary records Mr. Mason's travel and interviews with researchers across the United States, meetings with Rockefeller Foundation fellows and university administrators, and memoranda of internal discussions among staff on Rockefeller Foundation natural science research projects around the globe between January 2, 1934 and June, 1936. A number of discussions recorded in the diary are concerned with the difficulties surrounding funding and maintaining research projects throughout the United States and Europe despite the depressed economic conditions.