I don't have pages or links for these states yet but welcome any suggestions:
AK, DC, HI, ID
Hudson showrooms (various cities)
Imperial showrooms (various cities)
Lincoln Library (Lincoln, United Kingdom)
Ferrari & Maserati Showroom: 1, 2 (Egham, United Kingdom)
Malayan Motors Building (Singapore)
BOOKS
The American Automobile Dealership: A Picture Postcard History, Jay Ketelle, 1980
The American Car Dealership, Robert Genat, 1999
Classic Chevrolet Dealerships: Selling the Bowtie, Jon G. Robinson, 2003
You Auto See Maine: When Old Cars Were Young and for Sale in Maine, Will Anderson, 1999