Many books of his teachings were published. They followed a pattern: he would give talks, they would be recorded. The tapes would be worked up into a typed manuscript by some of his followers. The manuscripts would be published, at first in India, and without ISBN numbers, so they were at first bought by his admirers. Later some of the best were reprinted in the West. His talks covered a wide range of religions and philosophies. The total number of books is not known, but it was certainly more than 30.