Addition
- Correspondence---Harris, David P., 1865
- Correspondence---Huger, Benjamin, 1855
- Correspondence---Lanman, Charles, 1870
- Correspondence---Morse, Sidney E., 1827-1850
- Correspondence---Morse, Sidney E., 1851-1866
- Correspondence---Morse, Sidney E., 1867-1868
- Correspondence---Nicholson, Charles G., 1871