Abstract
BART J. BOK, Harvard Observatory, prepares a Newsletter each month for the American Astronomical Society which is intended to keep scientific societies informed about progress in various branches of astronomy during the disruption of exchange of information. Some of the notes are duplicated in other publications, such as Sky and Telescope, and by Science Service. The present issue, No. 17, contains brief references to papers and notices in Harvard Announcement Cards, the Astrophysical Journal, Popular Astronomy, etc. A considerable portion is devoted to a review of contributions by Dr. N. T. Bobrovnikoff and others on the physical properties of comets.
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