Names
- Langenheim, Frederick, 1809-1879.1
- Laurie & Whittle.1
- Lawrence, Abbott, 1792-1855--Portraits.1
- Lever Brothers and Unilever, ltd.1
- Marconi, Guglielmo, 1874-1937--Portraits.1
- Mather, John A. (John Aked), 1829-1915.1
- Meigs, Montgomery, 1847-1931.1
- Mount Washington Cog Railway.1
- New York Elevated Railway Company.1
- North, Frederick, Lord, 1732-1792.1
- Northern Pacific Railway Company.1
- Pennsylvania Railroad.1
- Pitts, John, 1765-1844.1
- R.P. Hall & Company (Nashua, N.H.)1
- Rimmel, Eugene.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
- Rowlandson, Thomas, 1756-1827.1