Names
- Mather, John A. (John Aked), 1829-1915.1
- Meigs, Montgomery, 1847-1931.1
- Mercantile Library Association of the City of New-York.1
- Mount Washington Cog Railway.1
- Murphy, Henry Cruse, 1810-1882.1
- New York Elevated Railway Company.1
- New York State Library.1
- Northern Pacific Railway Company.1
- Palfrey, John Gorham, 1796-1881.1
- Parkman, Francis, 1823-1893.1
- Pearson, John.1
- Pennsylvania Railroad.1
- Pennsylvania State Library.1
- Pennypacker, Samuel W. (Samuel Whitaker), 1843-1916.1
- Quaritch, Bernard, 1819-1899.1
- Rich, O. (Obadiah), 1777-1850.1
- Robbins, Frank, 1846-1924.1
- Rockefeller, John D., III (John Davison), 1906-1978--Portraits.1
- Roebling, John A. (John Augustus), 1806-1869--Portraits.1
- Roebling, Washington Augustus, 1837-1926--Portraits.1