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Gentlemen,  found  an old 1940 book US Naval Academy,  Plane and Spherical Trigonometry , by Kells, Kern, and Bland.  Admittedly,  majority of the book is trig and exercises, but there are a few spherical trig items which will be helpful if the battery  is dead.  What I personally like about this book, it  does not consider its reader too knowledgable and therefore explains everything to the bone. Which is as a refresher I personally found helpful.  Just for information, of course. ;> ;>

Thank you