| Morrisdale Railway No. 3, Morrisdale, PA |
201 |
| Mount Hope Coal & Coke Co., Sterling Run, PA |
948 |
| Muncy Lumber Co. No. 2, Saint Paul, PA |
1101 |
| Muncy Lumber Co., Saint Paul, PA |
X285 |
| Nansen Chemical Co., Nansen, PA |
X468 |
| Nansen Chemical Co., Nansen, PA |
514 |
| National Chemical Co. No. 1, Lyman Run, PA |
514 |
| New York & Pennsylvania Co., Johnsonburg, PA |
X220 |
| New York & Pennsylvania Co., Johnsonburg, PA |
252 |
| Newcomer Coal Co., Uniontown, PA |
X60 |
| Niles Fire Brick Co., Lucinda, PA |
X44 |
| North American Refractories Co., North Bend, PA |
X478 |
| North American Refractories Co., Renovo, PA |
X475 |
| North Bend Fire Brick Co., North Bend, PA |
X478 |
| Norwich Lumber Co. No. 20, Norwich, PA |
638 |
| Nusbaum Chemical Co. No. 4, Fuller Brook, PA |
X536 |
| Ohiopyle Lumber Co., Ohiopyle, PA |
X256 |
| Olds, Fred C., Crosby, PA |
X203 |
| ONeil, Henry, Lucinda, PA |
X27 |
| Osceola Silica Fire Brick Co. No. 1035, Osceola, PA |
1035 |
| Pardee Lumber Co. No. 110, Pardee Station, PA |
110 |
| Pardee Lumber Co. No. 121, Pardee Station, PA |
121 |
| Pardee Lumber Co. No. 59, Pardee Station, PA |
59 |
| Pardee Lumber Co. No. 71, Pardee Station, PA |
71 |
| Pardee Lumber Co. No. 91, Pardee Station, PA |
91 |
| Pardee Lumber Co., Pardee Station, PA |
76 |
| Penn Chemical Co., Hutchings, PA |
X334 |
| Perry Lumber Co. No. 265 ALFARATA, New Germantown, PA |
265 |
| Perry-Moshannon Mining Co., Spruce, PA |
1651 |
| Philadelphia & Reading Coal & Iron Co. No. 222, Reading, PA |
222 |
| Pine Creek Lumber & Timber Co. No. 3, Van Dyke, PA |
696 |
| Pine Creek Lumber & Timber Co. No. 4, Van Dyke, PA |
1259 |
| Pine Creek Lumber & Timber Co., Van Dyke, PA |
X532 |
| Pinkerton Lumber Co. No. 149, Pinkerton, PA |
149 |
| Poe Valley Railroad No. 1, Poe Mills, PA |
X200 |
| Poe Valley Railroad No. 2, Poe Mills, PA |
X191 |
| Potato Creek Railroad No. 20, Norwich, PA |
638 |
| Powers, P. H., Cornplanter, PA |
X1 |
| Queens Run Fire Brick Co., North Bend, PA |
X478 |
| Queens Run Fire Brick Co., Renovo, PA |
X475 |
| Queens Run Refractories Co. No. 4, Clinton County, PA |
X80 |
| Quinn, T. H. - & Co., Straight, PA |
X229 |
| Railroad Museum of Pennsylvania No. 4, Strasburg, PA |
1237 |
| Raleigh Callihan Coal Co., Uniontown, PA |
X60 |
| Rays Smithing Coal Co., Friedens, PA |
X515 |
| Reichley Brothers & Co. No. 1, Milroy, PA |
X200 |
| Reichley Brothers & Co. No. 1, Poe Mills, PA |
X200 |
| Reichley Brothers & Co. No. 2, Milroy, PA |
X191 |
| Reichley Brothers & Co. No. 2, Wells Tannery, PA |
X191 |
| Reichley Brothers & Co. No. 3, Milroy, PA |
373 |
