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edited by Helmut A. Abt.
University of Chicago Press c1999
Available at 2 libraries
W.W. Morgan, H.A. Abt, J.W. Tapsoff
Yerkes Observatory, University of Chicago , Kitt Peak National Observatory 1978
Available at 4 libraries
by Helmut A. Abt & Eleanor S. Biggs ; compiled at the Kitt Peak National Observatory
Printed by Latham Process Corp 1972
Available at 5 libraries
by H. A. Abt ...[et al.]
1968
Available at 3 libraries
