Photographic investigations of faint nebulae

THE UNIVERSITY OF CHICAGO PRESS CHICAGO, ILLINOIS
THE BAKER & TAYLOR COMPANY NEW YORK
THE CAMBRIDGE UNIVERSITY PRESS LONDON
THE MARUZEN-KABUSHIKI-KAISHA TOKYO, OSAKA, KYOTO, FUKUOKA, BOMBAY
THE MISSION BOOK COMPANY SHANGHAI
The University of Chicago
Publications of the Yerkes Observatory
VOLUME IV PART II
PHOTOGRAPHIC INVESTIGATIONS OF FAINT NEBULAE
BY EDWIN P. HUBBLE
THE UNIVERSITY OF CHICAGO PRESS CHICAGO, ILLINOIS
Copyright 1920 By The University of Chicago