This fourth volume of the "Census" provides all available bibliographical info. concerning works in jyotihsastra & related fields & biographical info. concerning their authors. Jyotihsastra is traditionally divided into 3 skandhas or branches: hora or genethlialogy & other forms of horoscopic astrology, ganita or mathematics & mathematical astronomy, & samhita or divination. This volume contains articles on authors whose names being with labials (p, ph, b, bh, & m). These are preceded by material supplemental to vol. I, II, & III. This material consists of abbrev. of new periodicals & serials that have been consulted, a biblio. of books & articles that have been noticed since volume III went to press, & a list of additional catalogs that have been utilized.