A few books on the site have been referred to on our own forum such as Anwar ul Bisharah, Kifl ul Faqeeh, ad Dawlat ul Makkiya, Radd ur Rafda, Nahj us Salam etc. Let's hope one day these books can be in html format so they're much clearer instead of just scans.
Shaykh GF Haddad wrote: "As for Imam Ahmad Rida Khan and his works, whoever does not recognize their worth as one of the treasures of this Umma is a blasted nincompoop who should wear a dunce cap until he learns." Sidi Asif posted a link to the Fatawa Ridawiya. On the same site are 57 of these treasures: http://www.alahazratnetwork.org/dlibrary/index.htm