548.7 Wyc A Wyckoff, Ralph Walter Graystone, 1897- The analystical explession of the results of the theory of spaces-groupsby Ralph W. G. Wyckoff. Washingtong, Carnegie Institutin of Washingtong, 1922 vii, 180 p. ilus. 25 cm. ( Carnegies Institution of Washington. Publication no. 318)