OF

THE ASTRONOMICAL OBSERVATORY OF HARVARD COLLEGE

VOLUME 97

THE HENRY DRAPER CATALOGUE

17h AND 18h

BY

ANNIE J. CANNON

CURATOR OF ASTRONOMICAL PHOTOGRAPHS

AND

EDWARD C. PICKERING

LATE DIRECTOR OF THE OBSERVATORY

ALIFORNIA

ATLOS ANGELESİ BRARY

CAMBRIDGE, MASS.
PUBLISHED BY THE OBSERVATORY

1922

103316