The Universidade Estadual Paulista (Unesp) makes 50 of his works available for free download.
To download them, you need to go to the site and look for the ones that, in the catalog, are priceless.
You will also need to sign up for an account so that you can log in to the site and download any books you want.
But let’s face it, this is a small price to be able to obtain several interesting works.