We had inadvertently given two objects the same Whitman Archive ID (loc.00847), although both were entered into the project database with different IDs. I've assigned one, Letter from William E. Babcock to Walt Whitman, 21 January 1865, a new Whitman Archive ID. Formerly loc.00847, the letter is now loc.01069.
The old url for the item was http://whitmanarchive.org/biography/correspondence/cw/tei/loc.00847.html
The current url is http://whitmanarchive.org/biography/correspondence/cw/tei/loc.01069.html