514.6 K Kells , Lyman Morse , 1888 - Spherical trigonometry , with naval and military applications , by Lyman M . Kells . Willis F . Kern and James R . Bland . 1a . ed . New York and London , McGraw-Hill book company , inc , 1942 . 163 p . incl . front . illus . diagrs . 23 cm . "Answers" : p . 153-163 No disponible.