File:Honey Dreamers 1947.jpg

Summary
"A notice for the collective work will not serve as the notice for advertisements inserted on behalf of persons other than the copyright owner of the collective work. These advertisements should each bear a separate notice in the name of the copyright owner of the advertisement."
 * There are no copyright marks on the ad which is seen at link above in full.
 * The ad would not have been covered by copyright(s) on the Star Tribune.
 * US Copyright Office page 3-magazines are collective works (PDF)