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- Date:
- 1880, 1870-1879, and 1860-1869
- Description:
- June 1863-May 1880 Observations - thermometer, hygrometer, barometer, and wind and weather readings
- Date:
- 1880, 1870-1879, and 1860-1869
- Description:
- Georgetown Observations 1868-1880
- Date:
- 1880
- Description:
- Caption: 'John L. Sibley, A.M., Librarian Emeritus of Harvard College, from a photograph by G. W. Pach.' [full date September 18, 1880]
