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Welchons A M, Krickenberger W R, . (1949). Plane geometry. Boston, USA: Ginn and Company.
Welchons A M, Krickenberger W R, . 1949. Plane geometry. Boston, USA: Ginn and Company.
Welchons A M, Krickenberger W R, . Plane geometry. Boston, USA: Ginn and Company. 1949.
