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Welchons A M, Krickenberger W R, . (1952). New plane geometry. Boston, USA: Ginn and Company.
Welchons A M, Krickenberger W R, . 1952. New plane geometry. Boston, USA: Ginn and Company.
Welchons A M, Krickenberger W R, . New plane geometry. Boston, USA: Ginn and Company. 1952.
