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by Schlotzhauer, Sandra D.; Littell, Ramon C.
by Freund, Rudolf; Littell, Ramon
by Littell, Ramon; Stroup, Walter W.; Freund, Rudolf
by Littell, Ramon; Stroup, Walter W.; Freund, Rudolf; et al.
by Freund, Rudolf J.; Littell, Ramon C.
by Littell, Ramon C.; Stroup, Walter W.; Freund, Rudof J.
by Littell, Ramon C.; Milliken, George A.; Stroup, Walter W.; et al.
by Freund, Rudolf; Littell, Ramon; Creighton, Lee; et al.
by Rudolf Freund (Texas A&M University); Ramon Littell (University of Florida); Iain Pardoe