i found 2 copies available...first editions...from www.ABEBOOKS.com
which is a service that lists the inventory of thousands of book dealers. unfortunatley they are going for $125.oo!

here is how one of them is described:

Songbook by Joan Baez

Baez, Joan Arrangements and Introduction by Elie Siegmeister.
Preface by John M. Conly, Illustrations by Eric Von Schmidt,
edited by Maynard Solomon.

Ryerson Music New York, 1964. Stated First edition Illustrated by color and two tone illus throughout text. Price still on dust jacket. Contents fine, cover near fine, dustjacket poor. Oversized hardcover with dustjacket Very good+ to near fine Hardcover in Dust jacket that has one triangular chip off tope edge, closed tears on bottom edge. 66 songs, including Portland Town, The Tramp On The Street, Long Black Veil, Lady Mary; East Virginia; Geordie; House Carpenter; Silver Dagger; Railroad Boy; Banks of the Ohio; Lonesome Road; We Shall Overcome; Amazing Grace; Portland Town; Where Have All the Flowers Gone, more.Contains arrangements, including guitar chords, for 66 songs taken from Joan Baez' early albums.