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This series contains correspondence about the studies as well as information about the donation of the collection to the Missionary Research Library. Thayer was a firm believer that the Missionary Research Library was important, and had used the resources for his own PhD thesis published in 1951. Thayer offered copies and details on the studied missionaries and their results to the Boards of Missionary Organizations and this series also contains that correspondence.

This series contains annotated copies of Dr. Thayer's PhD Thesis from the University of Pittsburgh. There are more appendices than what was included in the bound thesis volume; approximately two full copies of the appendices are available in this series. Each appendix includes different changes, additions and annotations by Thayer which ultimately would be used in the published version from 1951. Thayer also provided a copy of his submission to the overview committee from 1949.