Transportation and Communication
North Pennsylvania Railroad Company.
Northern Pacific Railroad Company.
Northern Texas Traction Co.
Northern and Southern West Virginia Railroad.
Norton, J. A.
O.W. Gray & Son.
Ohio Southern Railroad.
Ohio and Pennsylvania Rail-Road Company.
Okelomski, F. A.
Old Colony Railroad Company.
Olmstead, S. R. (Samuel R.)
Orange and Alexandria Railroad Company.
Oregon Railway and Navigation Company.
Osborne, R. B. (Richard Boyce)
Ourand, Charles H.
P.S. Duval & Co.
Pacific Coast Steamship Company.
Pacific and Atlantic Railroad Company.
Palmer, W. R. (William R.), -1862.
Palmer, William Jackson, 1836-1909.
Parge, H. R.
Parke, John G.
Parker, Nathan H. (Nathan Howe)
Parrott, George B.
Parsons, Charles R. (Charles Richard), 1844-1918?
Paterson and Dover Railroad.
Paterson, Passaic, and Rutherford Electric Railway.
Patterson, S. C.
Persac, Marie Adrien, 1823-1873.
Philadelphia & Reading Railroad Co.
Philadelphia Board of Trade. Committee on Inland Transportation.
Philadelphia and Erie Railroad.
Philadelphia, Baltimore & Washington Railroad Company. Maryland Division.
Philadelphia, Easton and Water Gap Railroad Company.
Philadelphia, Wilmington, and Baltimore Rail Road Company.
Phoenixville Cornwall Railroad.
Pinegrove Lancaster Railroad.
Pittsburgh, Bradford, and Buffalo Railway.
Pittsburgh, Fort Wayne, and Chicago Railway Company.
Pittsburgh, Marion, and Chicago Railway.
Plymouth, Kankakee, and Pacific Railroad.
Polley, J. F.
Poole, Henry W. (Henry Ward), 1825-1890.
Poor, Henry V. (Henry Varnum), 1812-1905.
Pope, John, 1822-1892.
Port Royal Railroad.
Portland & Ogdensburg Railroad Company.
Potomac and Ohio Railway.
Potomac, Fredericksburg, and Piedmont Railroad.
Preuss, Charles, 1803-1854.
Price, John, scripsit.
Putnam, Haldimand Sumner, 1836-1863.
Rabun Gap Railroad.
Railroad Commission of Texas.
Railroad Commission of Wisconsin.
Rand Avery Supply Co.
Rand McNally and Company.
Reading & Columbia Railroad Company.
Reed, A. J.
Regnier et Dourdet (Firm)
Rice, Graham L.
Richardson, Alfred M.
Richmond and Danville Railroad Company.
Richmond and Louisville Railroad.
Richmond, Van R.
Ridgway, Thomas S.
Rio Grande and Pecos Railway Co.
Ritchie & Dunnavant.
Ritter, Alfred H. (Alfred Hotchkiss), 1877-
Robert Sayer and John Bennett (Firm)
Robert, W. F.
Roberts, Solomon W. (Solomon White), 1811-1882.
Roberts, W. Milnor (William Milnor), 1810-1881.
Robertson & Seibert.
Robertson, Seibert & Shearman.
Rockford, Rock Island, and Saint Louis Railroad Company.
Roosevelt, Belle, 1892-1968.
Roosevelt, Theodore, 1858-1919.
Royal Land Company.
Ruggles, T. C.
Russia. Gidrograficheskīi departament.
Russia. Ministerstvo putei soobshchenīia. Otdiel statistiki i kartografīi.
Rutland and Burlington Railroad.
Sabine and Galveston Bay Railroad.
Sacramento Valley Railroad.
Sage (J.) & Sons.
Sanford, E. D.