indian sources of mahāmudrā were later compiled by the seventh karmapa "chos grags rgya mtsho" (1454- 1506) into a three-volume compilation entitled "the indian mahāmudrā treatises" (tib. "phyag rgya chen po 'i rgya gzhung"). this compilation includes the above three collections, along with the "anavilatantra" and texts that teach a non-tantric "instantaneous"approach to the practice by an indian master named sakyasribhadra.