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The University of Chicago
PUBLICATIONS OF THE YERKES OBSERVATORY
VOLUME IV PART II
PHOTOGRAPHIC INVESTIGATIONS OF
FAINT NEBULAE
BY
EDWIN P. HUBBLE
[Illustration]
THE UNIVERSITY OF CHICAGO PRESS
CHICAGO, ILLINOIS
COPYRIGHT 1920 BY
THE UNIVERSITY OF CHICAGO
All Rights Reserved
Published January 1920
Composed and Printed By
The University of Chicago Press
Chicago, Illinois. U.S.A.