Names
- Armistead, Walker Keith, 1783-1845.1
- Armitage, William Edmond, 1830-1873.1
- Armstrong, John, 1758-18431
- Arnold, Benedict, 1741-1801.1
- Ashburton, Alexander Baring, Baron, 1774-1848.1
- Asher & Adams.1
- Ashmead, Henry Buckley.1
- Atkinson, Thomas, 1807-1881.1
- Atwell-Hicks.1
- Atwill, Robert Edward, 1840-1911.1
- Auckland, William Eden, Baron, 1744-1814.1
- Auer, John Gottlieb, 1832-1874.1
- Austria. Armee.1
- Baird, Spencer Fullerton, 1823-1887.1
- Baldwin Locomotive Works.1
- Baldwin, Henry, 1780-1844.1
- Ball, John, 1794-1884.1
- Baltimore & Ohio Railroad Company.1
- Bank of the United States1
- Baring, Francis, Sir, 1740-1810.1