Casa Fernando Pessoa has put the author's surviving library of 1142 titles on their site with downloadable pdfs where possible. In addition to the books there are annotations, dedications, stamps and a bibliography concerning the library.
The books cover some familiar authors such as Aristotle, Wilde, Boccaccio, Poe, Wells along with a few surprises such as Baring-Gould. Most, though, are unfamiliar to me and I can't tell how much of them are simply not well known outside Portugal (or Europe) or whether they're actually more obscure. The listings are bare bibliography with no further detail.
The site seems to automatically display Portuguese or English depending on your location.