Dear Ms. Sarzynski,
Thank you for posting your request on History Hub!
The microfilm file Countries/Continents: China THRU Colombia (National Archives Identifier 145726594) is located in the series Security Classified General Name Index, 1917-1941 (NAID 2825078) (Microfilm Publication M1474) in the Records of the War Department General and Special Staffs (Record Group 165). The index has been digitized and can be viewed online in the Catalog. It relates to the series Security Classified Correspondence and Reports, 1917-1941 (NAID 305261) in Record Group 165, which has mostly not been digitized. For access to the non-digitized records, please contact the National Archives at College Park - Textual Reference (RDT2) at email@example.com.
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We hope this is helpful. Best of luck with your research!
Thanks so much!