[gutvol-w] Non working URLs

Greetings, I'm not sure this is the right mailing list. Please point to the right one otherwise. I have URLs of some PG books, but some of them are not working. e.g. http://www.gutenberg.org/dirs/etext04/cca0910.txt http://www.gutenberg.org/dirs/etext04/prgmt10.txt I got them from librivox site audiobook page. Can someone tell where did these books go and how to find new address of such books? Thanks & Regards, Ethan