THE SPECTRUM OF THE SPIRAL NEBULA NGC 4151
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© 1934. The Astronomical Society of the Pacific. All rights reserved. Printed in U.S.A.
Publications of the Astronomical Society of the Pacific,
Volume 46,
Number 271Citation N. U. Mayall 1934 PASP 46 134DOI 10.1086/124429
N. U. Mayall