Here is a link to some downloadable Klezmer stuff, including a couple selections from Kammens: The Cinncinati Klezmer Project

Volume 2, at least, is still in print:
Most Popular Kammen Folio
Of Favorite Jewish Songs, Vol 2
Pub.: Ashley Publications
Code: AS10212
Subject: Songs
Dimensions: 9 x 12 in.
List: 12.95

The Kammen folios featured all the most popular ethnic dance melodies of the day(originally published in the 1920's) and the tunes were labelled with simply the by the type of dance and a number, such as Freilach #11--The volumes in the collection were not all Jewish music, and many of the collections included dances from a number of ethnic groups, often including Polish, Italian, Jewish, Russian, and Greek. For Greek, the folio that I had said that you simply play the Jewish tunes. There was also a lot of repetition from one folio to another--

The folios were very widely used, and somewhere, I have a vinyl album of the orchestra from the King David Hotel in the Catskills with the identified simply by dance name and number--not a very exciting album, but I suppose you have to expect that when the music is just played by number--