Hynek, J. Allen (Joseph Allen), 1910-1986, editor. Astrophysics; a topical symposium commemorating the fiftieth anniversary of the Yerkes Observatory and a half century of progress in astrophysics.

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Hynek, J. Allen (Joseph Allen), 1910-1986, editor.

Astrophysics; a topical symposium commemorating the fiftieth anniversary of the Yerkes Observatory and a half century of progress in astrophysics.

Astrophysics.