These six volumes include approximately 20,000 reviews of items in number theory that appeared in Mathematical Reviews (MR) between 1984 and 1996. This is the third such set of volumes in number The first was edited by W. J. LeVeque and included reviews from 1940--1972; the second was edited by R. K. Guy and appeared in 1984. With the publication of the new review volumes, readers now have available reviews in number theory covering more than half a century.