What type of details about ed bearss can be gathered from the following bio? Bio: edwin cole bearss -lrb- ; born june 26 , 1923 -rrb- , a united states marine corps veteran of world war ii , is a military historian and author known for his work on the american civil war and world war ii eras and is a popular tour guide of historic battlefields for the smithsonian associates . he served as chief historian of the national park service from 1981 to 1994 .
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