Among the most popular here at grip central:
Maxalding Strength Library
Sandow Museum
These fine people have taken the ORIGINAL, public domain texts of the legendary oldtime strongmen and have made them freely available to physical culturists the world over. Check them out! Just be sure to thank them for their unselfish devotion to the iron game!
As always the Old Time Strongman Library stuff is "permalinked" to the right.