Posted here (PDFs above):
In Re Walt Whitman: Edited By His Literary Executors, Horace L. Traubel, Richard Maurice Bucke, Thomas B. Harned (Philadelphia: David McKay, 1893)
— posted by Roger W. Smith
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In Re Walt Whitman was originally published in a limited edition of one thousand copies. I own copy number 614 of the original edition. It was autographed by Horace Traubel.
Roger W. Smith's Walt Whitman site 