This is the third anga sutra of the twelve anga sutra containing the preaching of Lord Mahavir. This scripture is written in a particular style, having the information associated with numbers. For example, how many things in this universe are just one. This association goes up to hundred. It has the original shlokas in Ardha-maagadhi, with their elaborated explanation in Gujarati.
Jain principles and theories are preserved in the form of scriptures called Jain agamas. This book is one of those. It's a must read for all those who want to understand scientific Jain concepts thoroughly.