Sandow Plus is a great website dedicated to the old-time strongmen. One of the best features of the site is the free downloads of scanned copies of classic books from the late 19th century through the 1970s. It's free to read these classic works. Here is a classic dealing with traditional isometrics - Samson's System And Methods by Alexander Zass.

http://www.sandowplus.co.uk/Competition/Zass/Methods/Samson's%20System/Samson's%20System/album/index.html