I came across a vintage Pittsburgh Motor Club Membership Packet, 1938, on eBay earlier this evening, July 9, 2020. Very interesting and, probably, rather scarce, particularly in regards to the completeness of the packet. Several vintage road maps, a Hobbs Guide which mentions the Lincoln Highway, etc.
The packet's up for bid now, with a Best Offer option. If you yourself are not interested, maybe you know someone who would be. I have no connection to the auction whatsoever.
Link: https://www.ebay.com/itm/Travel-Automobiles-Pittsburgh-Motor-Club-Membership-Packet-First-Edition-1938/154000016148?hash=item23db1dc314:g:VfAAAOSwGQNfBlcq