Higgins to Joseph Henry. New York City, April 21, 1866. Ethnographic notes and vocabulary (pages 23-29) of Apache tribes of Arizona Territory ...collected from captives belonging to the Chiricahua, Sierra Blanca, Pinal and Coyotero tribes... (according to letter to Gibbs, May 2, 1866 -- see Manuscript No. 171). 30 pages.
Henry to Gibbs. April 24, 1866. Transmitting Higgins Manuscript for comment. 1 page.
Gibbs to Henry. April 25, 1866. Rough draft of letter commenting on Higgins Manuscript 2 pages.
Gibbs to Higgins. April 25, 1866. Rough draft of letter about Manuscript and Higginsʹ future work. 3 pages.