In 1995, Weisstein converted a Microsoft Word document of over 200 pages to hypertext format and uploaded it to his webspace at Caltech under the title "Eric's Treasure Trove of Sciences." After Weisstein transferred to the University of Virginia to continue his work in astronomy, he continued to refine his fledgling encyclopedia. In November 1998, Weisstein made a deal with the CRC Press to publish his encyclopedia in book format as the CRC Concise Encyclopedia of Mathematics. A year later, in 1999, Weisstein accepted the position of encyclopedist at Wolfram Research, Inc. (WRI). "MathWorld" was ready to be unveiled in December 1999 with nearly 13,000 entries, most of them written by Weisstein, encompassing a variety of disciplines, including algebra, geometry, calculus, discrete mathematics, topology, number theory, statistics, and the foundations.