The MK process at 50 years : a powerful tool for astrophysical insight : a workshop of the Vatican Observatory, Tucson, Arizona, U.S.A., September 1993 / edited by C.J. Corbally, R.O. Gray, and R.F. Garrison.
Morgan, W. W. (William Wilson), 1906-1994
Keenan, Philip C. (Philip Childs), 1908-
Stars -- Spectra -- Congresses.
Stars -- Classification -- Congresses.
Astronomical photometry -- Congresses.
Corbally, C. J. (Christopher J.)
Gray, R. O. (Richard O.)
Garrison, R. F. (Robert F.)