Some time ago, I filled out the NARA form to obtain an Official Military Personnel File (OMPF) for an individual who served in WWI. Yesterday, I received a reply -- a joyous day! Alas, the individual's OMPF probably burned up in the 1973, but there was a Final Pay Roll bearing this individual's name. I received an image of the roster (uncertified) along with a handy file on how to interpret the information in the document. Fabulous! -- I now know what unit with which he served and his enlistment and demobilization dates, and as a bonus, have a copy of his signature. What I did not have in the response report is a citation. Some digging in the NARA catalog led me to this series, World War I Enlisted Men Final Military Pay Vouchers, 1917–1921; and this record group, Records of the National Archives and Records Administration, 1789–ca. 2007, Record Group 64 (https://catalog.archives.gov/id/1436496). Alas, I have no box or file number as a search of the record group leads me in a loop back to the series page. But, I did learn that this series is housed in St. Louis.
But wait, NARA provided a description of the record group at the "Guide to Federal Records"! Alas, it, too, is little to no help whatsoever: https://www.archives.gov/research/guide-fed-records/groups/064.html#64.9.
The "Overview of Records Locations" button on the "Guide to Federal Records" page for RG 64 leads me to information that the NRPAO (Archival Operations and Facility Planning Branch) "cluster" (14,575 cu. ft.!) is located in St. Louis.
In an effort to cite what I used, here is my feeble attempt at a first reference note citation:
Final Pay Roster, Company A, 21st Battalion, U.S. Guards, 30 November 1918, entry for Thomas E. Pierce; image, supplied by the National Personnel Records Center, St. Louis; citing, World War I Enlisted Men Final Military Pay Vouchers, 1917–1921; Record Group (RG) 64: Records of the National Archives and Records Administration, 1789–ca. 2007; National Archives, St. Louis, Missouri.
The source entry? Perhaps:
World War I Enlisted Men Military Pay Vouchers, 1917–1921. Record Group 64: Records of the National Archives and Records Administration, 1789–ca. 2007. National Archives, St. Louis, Missouri.