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Eucharisterion: essays presented to Omeljan Pritsak on his sixtieth birthday by his colleagues and students. Vol. III/IV 1979-1980 Part 1 ed. I. Ševčenko, E. Sysyn — Cambridge, MA Ukr. Research Inst. of Harvard Univ. 1980 — 496p. ISBN:  ISSN:  0363-5570