I have found my authority here

Whitman Archive Title: I have found my authority here
Whitman Archive ID: nby.00004
Repository ID: Case folio Y 245 .W5918
Repository: Catalog of the Walt Whitman Prose Manuscripts in the Newberry Library
Repository Title: Notes and fragments: left by Walt Whitman and now edited by Dr. Richard Maurice Bucke, one of his literary executors
Date: about 1879
Genre: prose
Physical Description: 1 leaf, handwritten
View Images: 1
Content: A short prose manuscript that appears to be related to portions of Specimen Days , specifically "An Egotistical 'Find'." This piece was first published in Specimen Days & Collect (1882), and was included in Complete Prose . A note in another hand identifies this manuscript as part of "the Denver Diary of W. W." This manuscript is mounted in a copy of Notes and Fragments (1899), leaving the verso unavailable.