While a classical Tantra, many scanned manuscripts on Archive.org contain large appendices dedicated to Shabar prayogas (applications).
A specific genre of texts dedicated to the monkey god. In Shabar tradition, Hanuman is the Dwarapala (gatekeeper) of the Kali Yuga. These PDFs often contain the famous "Hanuman Shabar Mantra" which goes something like: "Om hreem hanumate som som ..." (though variations are endless). shabar mantra archive.org
For serious practice, consider using Archive.org as a reference, then cross-checking with a living practitioner or a clearer modern publication. While a classical Tantra, many scanned manuscripts on
Archive.org respects copyright. Most Shabar texts are under public domain because: Archive
However, some modern compilations from publishers like Diamond Pocket Books (1990s) are copyright protected and should not be downloaded if the upload date is recent.