Sorry, if you know all these already
pirate site deleted
I managed to get the first shadow and first doc savage book from there fot free. But they are not all free.
http://www.munseys.com/site/home
used to be blackmask
this page gives you links
http://www.techsupportalert.com/best...oks-online.htm
pirate site deleted
some free, some not
the two most obvious ones
https://archive.org/browse.php?field...bcomicuniverse