Author
Philadelphia Record
2
Springirth, Kenneth C.
2
American Transit Accountants' Association
1
American street and interurban accountants' association
1
Bowman, Stanley F.,
1
Bucks County Electric Railway Company
1
Central Electric Railfans' Association
1
Cox, Harold E.
1
Cox, Harold E.,
1
DeGraw, Ronald, 1942-2006,
1
Denney, John Dewitt, Jr
1
Hamilton Library and Historical Association of Cumberland County, Carlisle, Pa
1
J.G. Brill Company
1
Lentz, Harry David
1
Lentz, Harry David, 1889-
1
Pennsylvania. Bureau of Railways
1
Pennsylvania. Department of Internal Affairs. Bureau of Statistics
1
Sebree, G. Mac 1932-2010,
1
Siebert, C. L.
1
Springirth, Kenneth C.,
1