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Using the cemetery's own burial records, plus government, military and privately owned documents available online, Green-Wood's project has identified the graves of about 4,600 Civil War veterans. Green-Wood historian Jeffrey Richman estimates 3,000 to 4,000 more are scattered among the cemetery's more than 560,000 total interments.
The Civil War dead buried at Green-Wood include unknown privates and famous officers, buglers and Medal of Honor recipients, Yankees from Maine to Iowa, fathers, sons and brothers, and even 75 Confederates, including two generals. None of the original gravestones for the Confederates gave any indication they had fought for the South, an intentional omission being rectified by the installation of new granite markers provided by Veterans Affairs.