Manchuria (including Jehol) : pre-1931 administrative areas / R & A, IRIS.
MLA
of State. Interim Research, United States. Department, et al. Manchuria (Including Jehol) : Pre-1931 Administrative Areas / R & A, IRIS. Reproduction Branch, SSU, 1945. https://collections.library.yale.edu/catalog/15510645.
APA, 6th edition
of State. Interim Research, U. S. D., Research, I. S., & Branch, A. (1945). Manchuria (including Jehol) : pre-1931 administrative areas / R & A, IRIS. [Maps]. Reproduction Branch, SSU, https://collections.library.yale.edu/catalog/15510645.