Nand, Brahma. Co-ordinate solid geometry : co-ordinate geometry of three dimensions for degree, honours, and post-graduate classes / Brahma Nand, B. S. Tyagi and Bhu Dev Sharma. - Meerut : Kedar nath ram nath, [...?]. - iv, 614 pages : illustrations ; 23 cm. Subjects--Topical Terms: Geometry. Dewey Class. No.: 516.06 NAN