Log Log Duplex Decitrig Slide Rule ManualLyman M. Kells, Willis F. Kern, James R. Bland · First published 1955Open the Tome
plane and spherical trigonometrylyman m. kells, willis f. kern, jamess r. bland · First published 1940 · Latest edition 1951Open the Tome
Spherical trigonometryLyman M. Kells, Willis F. Kern, James R. Bland · First published 1940Open the Tome
Plane and spherical trigonometryLyman M. Kells, Willis F. Kern, James R. Bland · First published 1935Open the Tome
