I doubt the CD was released in the USA, but if you're really interested I can make you a tape of it, as well as of some other stuff I've got. Maybe there is a way to share a few examples with this thread, if someone put them on their website. Don't know about infringement of copyright, though.
I haven't had time but I will (some day) look for relevant German sites which may even have sound files. A place to start might be Old Songs New Songs, a German folk music mail order firm, but the site is in English. If you click on 'Search Catalogue' you can scroll down to various sections on Germany. There are no infos on the artists, though, just the list of albums.