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1. Plane and spherical trigonometry

by Kells, Lyman M; Kern, Willis F; Bland, James R.

Edition: 3rd ed.Publisher: New York McGraw-Hill 1951Availability: Items available for loan: Central Library, BUET [514 KEL/1951] (2).

2. Plane and spherical trigonometry

by Kells, Lyman M; Kern, Willis F; Bland, James R.

Edition: 3rd ed.Publisher: New York McGraw-Hill 1951Availability: Items available for loan: Central Library, BUET [514/KEL/1951] (1).