This swank bookmark-slash-order-form [click for larger scans] which I found in a book led me to this informative site about Paul Elder’s Books:
For seventy years, Paul Elder’s bookstores were a fixture in downtown San Francisco. There was not a single bookstore but a series of six, plus short-lived forays to New York City and Santa Barbara. The early shops were the most memorable, small momuments to the Arts & Crafts aesthetic. They were known as much for their ambience and array of art objects as for the books themselves.
Seems if this bit of ephemera is any indication those last two sentences are certainly true.