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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. 1961 The classification of clusters of galaxies. Proc. Natl. Acad. Sci. U. S. A. 47:905–906. 1962 Some characteristics of galaxies. Astrophys. J. 135:1–10. 1964 With T. A. Matthews and M. Schmidt. A discussion of galaxies identified with radio sources. Astrophys. J. 140:35–49. With J. S. Neff. Stellar population of the nuclear region of the Andromeda nebula. Astron. J. 69:145. 1965 With J. R. Lesh. The supergiant galaxies. Astrophys. J. 142:1364–65. 1968 A comparison of the optical forms of certain Seyfert galaxies with the N-type radio galaxies. Astrophys. J. 153:27–30. 1969 With D. E. Osterbrock. On the classification of the forms and the stellar content of galaxies. Astron. J. 74:515–24. 1970 With L. P. Bautz. On the classification of the forms of clusters of galaxies. Astrophys. J. Lett. 162:L149–53. 1971 A unitary classification for N galaxies. Astron. J. 76:1000–1002 With N. R. Walborn and J. W. Tapscott. An optical form morphology of Seyfert galaxies. Pontif. Acad. Sci. Scr. Var. 35:27–40. 1973 With P. C. Keenan. Spectral classification. Annu. Rev. Astron. Astrophys. 11:29–50. 1977 With S. Kayser and R. A. White. cD galaxies in poor clusters. Astrophys. J. 199:545–48.
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