Author
J.G. Brill Company
3
Philadelphia Record
3
Brill (J. G.) Company, Philadelphia
2
Cox, Harold E.
2
Cox, Harold E.,
2
Springirth, Kenneth C.
2
American Transit Accountants' Association
1
American street and interurban accountants' association
1
Baldwin Locomotive Works
1
Blankenburg, Rudolph, 1843-1918
1
Bowman, Stanley F.,
1
Bucks County Electric Railway Company
1
Camden and Trenton Railway
1
Central Electric Railfans' Association
1
Central Railfans' Association
1
DeGraw, Ronald, 1942-2006,
1
Denney, John Dewitt, Jr
1
East Troy Electric Railroad Museum (Wis.)
1
Hamilton Library and Historical Association of Cumberland County, Carlisle, Pa
1
King, Clyde L. 1879-1937
1
King, LeRoy O.
1
Lentz, Harry David
1
Lentz, Harry David, 1889-
1
Lind, Alan R.
1
Merriken, John E.
1
Pennsylvania. Bureau of Railways
1
Pennsylvania. Department of Internal Affairs. Bureau of Statistics
1
Philadelphia (Pa.) Dept. of Public Works
1
Sebree, G. Mac 1932-2010,
1
Siebert, C. L.
1
Springirth, Kenneth C.,
1
Stern & Silverman (Philadelphia)
1
Steuart, W. M.
1
United States. Bureau of the Census
1