I understand that Professor Corbin took interviews of Allamah Tabatabai (ra) and published them. Are these interviews still available today and, if so, where can I find them?
Yes. You can find many material regarding Professor Henry Corbin and Allama Tabataba'ee in many websites if you search a little bit. There is book in English titled (Negotiations and correspondence Professor Henry Corbin with Alama Tabataba'ee) which you find it online.
Wassalam.