The Rev. Claude L. PICKENS (1900-1985) and his wife, Elizabeth Zwemer Pickens were Christian missionaries working with the China Inland Mission. They had a scholarly and evangelical interest in Hui (Han Chinese Muslims). In 1933 and in 1936, Pickens and other missionaries undertook surveys of Hui in northwest China, northeast Tibet and Inner Mongolia, including a thorough photographic record. For more information on Claude and Elizabeth Pickens, see https://library.harvard.edu/collections/rev-claude-l-pickens-jr-collection-muslims-china.