Me again. Having trouble formulating the source of the source for Ancestry's WW2 Draft Registration (Fourth Registration for New York). Most of the records I am looking at are in Brooklyn, NYC
Let's take for example: https://www.ancestry.com/imageviewer/collections/1002/images/NY-2370398-4560?
Ancestry gives us as the source: The National Archives at St. Louis; St. Louis, Missouri; Record Group Title: Records of the Selective Service System; Record Group Number: 147