Yes, books published before 1924 that have entered the public domain, such as Kaalachakranbanuphala Granthamu (1895), are legally available for free download on platforms like the Internet Archive.

If you are building your digital library, several foundational texts translated into or originally written in Telugu are highly sought after: 1. Brihat Parasara Hora Sastra (Telugu Edition)

Several digital libraries host historical and rare Telugu astrology manuscripts that have been digitized for public access.

1. Brihat Parasara Hora Sastra (బృహత్పరాశరహోరాశాస్త్రం)

Advanced Stellar Astrology : Krishnamurti, K. S. : Free Download, Borrow, and Streaming : Internet Archive. Internet Archive Rare Telugu Astrology Books PDF - Scribd

Officially, the authors do not release the Butte Veerabhadra 100 Years Panchangam for free PDF download. It is a copyrighted, living text that you are encouraged to purchase in hard copy.