I have been collecting the books by Jane and Michael Stern for a long time. I just really like them. Roadfood was the first one I bought. It's dated 1978:
Square Meals is from 1984:
And they just seem like really neat people, too. A Taste Of America, 1988:
American Gourmet, 1991:
Eat Your Way Across The Usa (sounds good to me!) 1997:
Blue Plate Specials and Blue Ribbon Chefs, 2001:
The Blue Willow Inn Cookbook, 2002:
There was also a movie made about their real life, Ambulance Girl, which Kathy Bates directed and starred in. I saw it when it was on TV and I enjoyed it very much. They have written a number of other books that I don't have in my collection - and I will probably pick them up if I have the chance.
What a great job to have - traveling and writing about food!