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An Analysis of chromospheric emission lines at the 1962 eclipse
GROENEVELD,Robbert Coenraad: -- An Analysis of chromospheric emission lines -- at the 1962 eclipse. - Groningen 1974. -- 106 S.m.Fig.u.Tab.8° -- Groningen,nat.wiss.Diss.1974. -- 1976! -- M.