http://www.sandowplus.co.uk/
There is an incredible array of strength books on this site, from Goerner to Zass, that you can just click on and view.
http://www.ironhistory.com/forum/
This forum is a must for anyone interested in the history of strength and bodybuilding.
http://www.bodybuilding.com/fun/ironhistory1.htm
Need to know about Thomas Inch and his challenge dumbell, then read Joe Roark's Inch101.