Please answer the following question: What type of details about walter edgar  can be gathered from the following bio?  Bio: walter b. edgar -lrb- born december 10 , 1943 -rrb- is an american historian and author specializing in southern history and culture , particularly for south carolina . edgar has authored or edited several books about the state , including `` south carolina : a history '' and `` the south carolina encyclopedia '' . he is known for hosting the popular weekly radio show `` walter edgar 's journal '' on etv radio on historic and cultural topics , as well as the daily feature `` south carolina a to z '' on etv radio . edgar was born in 1943 in mobile , alabama and was raised there . edgar went to davidson college in north carolina for undergraduate studies , receiving a b.a. in history . edgar elected to continue history studies at the university of south carolina , graduating with both a masters and doctorate degree . following active duty in the u.s. army including a tour in vietnam , edgar returned to usc as a professor in 1972 while remaining in the army reserve , from which he retired as a colonel . he retired from usc after 40 years of teaching and research in 2012 . edgar was married to his first wife betty in 1966 . she died in 2005 following health complications . edgar remarried in 2007 to his current wife nela and splits his time between columbia and edisto beach .
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