Tantric Buddhism in India

I study the history and doctrines of mature esoteric or tantric Buddhism (ca. 750-1250 CE). Followers of these teachings broke away from ascetic restraint and rules of ritual purity in order to achieve supernatural powers and liberation from the bondage of transmigration. My source material is chiefly in Sanskrit (and in Classical Tibetan), most of it in still unedited manuscripts. I am interested in how tantric Buddhist practitioners organised their sub-culture and the ways in which they interacted with mediaeval South Asian, South East Asian, Himalayan, and Trans-Himalayan societies.