It was in the May 30, 1949 issue of Life Magazine.. "Speaking of Pictures"..These 68 veterans are all that survived of the 3,000,000 young soldiers who wore the Blue or the Gray in the great War that ended 84 years ago is the title..Go to this website (listed below) and you can buy a copy of the magazine, it appears, from their listing..Scroll down to the issue:
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http://www.2neatmagazines.com/life/1949.html

Excerpt Only: Life Magazine May 30, 1949-Cover-F.D.R. at age 2.--Photos of the 68 living veterans of the Civil War.
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Gay