black455 says:
Private research library. No patrons, just research staff.
I tried to discern a pattern amongst the covers you listed and from a single volume found nothing beyond the fact that they had either (1) iconic/patriotic designs, or (2) cute women. (7/18 is actually surprisingly risque). I thought maybe a self-censor took some initiative but I notice some of the most virulently racist illustrations I’ve ever seen (think: “Japs”=simians) remain amongst the covers left behind.
Good Luck in your search, racinchikki. Sorry you’ll have to do this the hard way…