I found this label for Seattle's "Art's Magazines" pasted to the inside back cover of Lesbian Love by Marlene Longman (generally thought to be the work of Marion Zimmer Bradley) Nightstand, 1960.
Art claims that, "neither of the establishment newspapers would touch this ad with a ten foot pole" so he stuck these in the books. Art's carried "Detectives, Westerns, Science Fiction... Girlie magazines, Danish Magazines from Copenhagen, Nudist Magazines, Bondage...and books on that 'ole suppressed sex'"
Sound's like a very well-stocked head shop. Anybody have pictures from insides Art's or similar defunct 1960s smut shops?