North America
COX, Harold E.
The Road from Upper Darby - The Story of the Market Street Subway-Elevated
CRAPO, Raymond
The Environment of the Traction Era - A Brief Study of the Electric Traction Industry in its American setting
CUMMINGS, O. R.
Street Cars of Boston - Closed Horse and Electric Cars 1887-1900
Street Cars of Boston - Volume One
CUMMINGS, O. R.
The Trolley Parlor Cars of New England
Transportation Bulletin No. 58 May - June 1959