. Collier's new encyclopedia : a loose-leaf and self-revising reference work ... with 515 illustrations and ninety-six maps. Dil/^ Ullsun Ohsovatary IRREGULAR NEBULA M 17. SAGITTARII (oMEGA) , JULY 29, 1919. ©Verkes Observatory Morehouses comet

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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921