Attributed — Dataset and original audit acquisition target
Earlier research points to the Brooks–Hefner circulation project and ABC material. The dataset and original ABC statements were not recovered for reinspection. Separate paid from complimentary copies, issue averages from half-year totals, and geographical reports from publisher claims. Earlier 309,715 and 324,930 figures remain unreconciled and are not presented as verified circulation.
Date: 1947–1953 research range
Locator: Historical magazine circulation research; original audit statements pending
Repository / source reference. For supplied archival reproductions, the repository link identifies custody; it is not a public link to the delivered scan.