George Willis Ritchey, Captain J. F. Hellweg, and the Building of the U. S. Naval Observatory Ritchey-Chrétien Reflector

Details George Willis Ritchey, Captain J. F. Hellweg, and the Building of the U. S. Naval Observatory Ritchey-Chrétien Reflector George Willis Ritchey, Captain J. F. Hellweg, and the Building of the U. S. Naval Observatory Ritchey-Chrétien Reflector

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989baas...21.1230o&link_type=gif

Bulletin of the American Astronomical Society, Vol. 21, p.1230

Astronomy and Astrophysics

Astronomy

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