One of 500 copies signed by the author with the 1978 addenda laid in.
La Mesa: Postal History Associates, 1977. Illustrated.
A masterful source of research information, with dates and founding, location, class rating, discontinuance dates, first postmasters, etc. Outdates the earlier work by Frickstad in 1955 and is easier to use as all entries are alphabetized statewide and not county by county.