I was looking for the source of Walt Whitman’s war reminiscences, and happened upon the Walt Whitman Archive. Not only does it have the published anecdotes, it also offers all his poetry and a trove of letters, too.
Whitman’s writing is very readable. I planned to leaf through some of the Memoranda, and wound up reading almost the entire collection. It’s a fantastic resource they’re offering, here.
Thanks for the kind notice of the Whitman Archive. I work there for Ken Price, who has been supporting grad students in English with this monumental project for more than 10 years. Try our bibliography search feature for any Whitman-related topic you can think of! You might also be interested in our newer related project, Civil War Washington, available here: http://civilwardc.org/
All this work is supported through the University of Nebraska and grants from the National Endowment for the Humanities and other government funding for public education.