ინფორმაცია
Sources
1. Harry Foesig, Barker Gummere and Harold E. Cox.
Trolleys of Bucks County, Pennsylvania. Published by Harold E. Cox, 1985.
2. Alan Lind.
From Horsecars to Streamliners: An Illustrated History of the St. Louis Car Company. Park Forest, IL: Transport History Press, 1978.
See also: a personal site of Dr. Harold E. Cox with author’s books and car builders’ order lists:
http://streetcars.telcen.com/