SEPTEMBER 1949 PRR PENNSYLVANIA RAILROAD BOOK OF RULES
MAY 1910 PRR PENNSYLVANIA RAILROAD BOOK OF RULES LINES WEST OF PITTSBURGH
APRIL 1925 PRR PENNSYLVANIA RAILROAD BOOK OF RULES
OCTOBER 1956 PRR PENNSYLVANIA RAILROAD BOOK OF RULES
1956 PRR Pennsylvania Railroad Book of Rules For Conducting Transportation
The Pennsylvania Railroad Book Of Rules 1951- 130 Pages