O, 1894-1920 Box 19, Folder 517 Bookmark Collection Context Yale University -Manuscripts and Archives Mabel Loomis Todd papers, 1863-1948…
O, 1910-1912 Box 62, Folder 243 Bookmark Collection Context Yale University -Manuscripts and Archives Mabel Loomis Todd papers, 1863-1948…
Obituaries [AMS and TMS], 1932-1932 Box 111, Folder 388 Bookmark Collection Context Yale University -Manuscripts and Archives Mabel Loomis Todd papers, 1863-1948…
O'Brien, Gertrude, 1897-1914 Box 19, Folder 518-522 Bookmark Collection Context Yale University -Manuscripts and Archives Mabel Loomis Todd papers, 1863-1948…
O'Brien, Minni J., 1904-1908 Box 19, Folder 523 Bookmark Collection Context Yale University -Manuscripts and Archives Mabel Loomis Todd papers, 1863-1948…
Observatory House, Amherst, Massachusetts: lists of furnishings, receipts for repairs and correspondence, 1898-1920 Box 125, Folder 88 Bookmark Collection Context Yale University -Manuscripts and Archives Mabel Loomis Todd papers, 1863-1948…
"Observing an Annular Eclipse," The Nation, 1907-1907 Box 75, Folder 260 Bookmark Collection Context Yale University -Manuscripts and Archives Mabel Loomis Todd papers, 1863-1948…
"Observing an Eclipse of the Sun," Harper's Bookmark Collection Context Yale University -Manuscripts and Archives Mabel Loomis Todd papers, 1863-1948…
"Observing the Eclipse," Optical Journal, 1905-1905 Box 75, Folder 248 Bookmark Collection Context Yale University -Manuscripts and Archives Mabel Loomis Todd papers, 1863-1948…
Ocean Park, Me., 1900-1900 Box 67, Folder 429 Bookmark Collection Context Yale University -Manuscripts and Archives Mabel Loomis Todd papers, 1863-1948…