There is a list of lyrics (but no music) of about 250 Carter Family songs http://www.icdc.com/~fmoore/carterfamily/index.html which is itself a page on http://www.traditionalmusic.co.uk/. This is also available on a CD-ROM with over 6,000 songs (including MIDIs, scores and lyrics,a nd often some notes on the songs) at a knock-down price through this website from Rod Smith in England.