The Adhyardhasatika Prajnaparamita is one of the most influential and revered scriptures in East-Asian esoteric Buddhism. Known as the Rishukyo, this sktra, in its Chinese version by Amoghavajra, has for centuries been at the core of the Shingon liturgy in Japan. Its Sanskrit text, however, was known until recently only through a fragmentary Central-Asian manuscript studied by Ernst Leumann in early twentieth century. This volume presents a critical edition of the Adhyardhasatika based on the a newly available photocopy, kept at the China Tibetology Research Center (Beijing), of a newly available Sanskrit manuscript from Tibet. Also edited in this volume is the Tibetan version of the text, Zes rab kyi pha rol tu phyin pa'i tshul brgya lna bcu pa, using fourteen exemplars of Kanjur and a Dunhuang manuscript. The introduction to the edition includes a survey of previous studies of on the Adhyardhasatika, a description of the materials used, as well as remarks on the distinctive features of the Sanskrit text. 168p (Austrian Academy of Sciences 2009).