Chinese Christian converts in Pingding, Shanxi Province, China, ca. 1920. The photograph is part of the Anna V. Blough China Missionary Collection, a digitization project worked on by History majors Elyse Ford, Morgan Nebbia, and April Tuggle in 2010.
With links to a variety of resources just for your discipline, this guide is a great place to start your research! Remember that these are only some of the sources that may be useful to you.