Shown is just an example.
Buffalo/East Side – Travel guide at Wikivoyage
Sale 759 Selections from the Library of Gerald and Barbara Weiner by Hindman Auctions - Issuu
A collector was 'bitten by the postcard bug' 80 years ago; see some of his favorites : The Picture Show : NPR
Vintage Postcards of Tourist Attractions: The Same View Then and Now
PPM - Picture Postcard Monthly
Directory D – Undivided-back Postcards
The Oxford Handbook of Twentieth-Century American Literature 0198824033, 9780198824039
The Best Vintage Postcard from Every State
Would you pay £1,000 for this post- card? - Picture Postcard Monthly