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by Cohen, Ronald Jay
by International Astronomical Union Symposium 1999 (Vienna, Austria); Sullivan, W. T., III; Cohen, Ronald Jay
by Cohen, Ronald Jay; Swerdlik, Mark E.
by Cohen, Ronald Jay; Swerdlik, Mark
by Cohen, Ronald Jay; Swerdlik, Mark; Sturman, Edward
by Cohen, Ronald Jay , Sturman, Edward , Swerdlik, Mark