The Nilavanti Granth Archive boasts an impressive collection of rare and ancient texts, including manuscripts, books, and other written materials. The archive's holdings include:

The most rigorous attempt to archive the Nilavanti Granth was undertaken by the in Mysore and the Bhandarkar Oriental Research Institute (BORI) in Pune in the 1960s. Under a project to catalog all extant Sanskrit and vernacular manuscripts, researchers found 47 different texts titled Nilavanti or Nilavanti Kalpa .

Practitioners and collectors genuinely believe that reciting the mantras incorrectly or simply viewing certain yantras without initiation can cause mental illness, family ruin, or spirit attachment. Consequently, many custodians of original manuscripts refuse to contribute to any accessible to the uninitiated.