If you are looking for a digital copy, here are the best avenues to explore:
The was composed by Mahidhara in the 16th century (some sources date it to 1588 CE). It is considered one of the most systematic and comprehensive manuals on Mantra Shastra, a branch of Tantra that deals with the science of sacred sounds.
Before diving into the PDF search, it is essential to understand what this text represents.
The mantras are categorized for various purposes, including healing, prosperity, protection from enemies, and spiritual enlightenment.
The (literally "The Great Ocean of Mantras") is a monumental 16th-century tantric compendium written by Mahidhara . It serves as an extensive encyclopedia for practitioners, detailing various mantras, rituals (vidhis), and the worship of numerous deities.