Author
The J. G. Brill Company
8
Buckingham Valley Trolley Association
1
Cox, Harold E.
1
DuPuis, Roger, II,
1
Harwood, Herbert H.
1
Meyers, Allen
1
Middleton, William D., 1928-2011
1
Pennsylvania Railway Museum Association
1
Philadelphia Trolley Coalition (Philadelphia, Pa.)
1
Spivak, Joel
1
Springirth, Kenneth C.
1
Wells, Bruce
1