RT Unpublished Material DB /z-wcorg/ DS http://worldcat.org ID 122589325 LA English A1 Herschel, John F. W., YR 1817 AB This collection concerns astronomical observations, earthquakes, meteorology, photography, physics, professional associations, publications, and scientific instruments. The correspondents include Augustus De Morgan, Dionysius Lardner, Sir Francis Beaufort, and Sir Edward Ryan.