23365801
9780977451135
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Has been called "Today's Grand Master of Master Keying", and has taught and written several books on this and other topics since the early 1970's.O'Shall, Donald A., Sr. is the author of 'Master Keying Text Book 2006 : Mktb2', published 2006 under ISBN 9780977451135 and ISBN 0977451135.
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