Thanks, but the advertisements from Sheet Music Plus says there are 1,000 songs in each volume. Here's the ad for Vol 1:

"About Jerry Silverman's Folk Song Encyclopedia, Volume 1

For voice and guitar. Piano/Vocal/Chords Songbook (Arrangements for piano and voice with guitar chords). Folk. Difficulty: easy-medium. Fake book. Vocal melody, lyrics, chord names and index of first lines. 432 pages. Published by Hal Leonard (HL.312143).

ISBN 0634084690. With vocal melody, lyrics, chord names and index of first lines. Folk. 9x12 inches.

Over 1,000 favorite songs representing categories such as: country cowboys, outlaws, love and courting, sentimental ballads, international favorites, children, Christmas, many more."

And from the blurb about Vol. 2:
"1,000 more favorite folk tunes covering categories: blues and jazz; gospel; bluegrass; comic; rounds; sea songs; patriotic; wartime; more."
http://www.sheetmusicplus.com/title/Jerry-Silverman-s-Folk-Song-Encyclopedia-Volume-2/2910071