Here's an excerpt from the 1981-08-13 Preface. The idea for the book goes back some twenty years, when I was impressed by the circulation of lists of problems by the late Leo Moser and co-author Hallard Croft, and by the articles of Erd\H{o}s. Croft agreed to let me help him amplify his collection into a book, and Erd\H{o}s has repeatedly encouraged and prodded us. After some time, the Number Theory chapter swelled into a volume of its own, part of a series which will contain a volume on Geometry, Convexity and Analysis, written by Hallard T.~Croft, and one on Combinatorics, Graphs and Games by the present writer. The Geometry volume (mainly due to Ken Falconer, a student of Croft) appeared in 1991 and UPINT2 in 1994. UPINT3 (still a single volume, but now with about 450 pages) should be out already, but Springer seem to be having trouble making Andy Guy's old program work. I've been able to make it work for at least six months, during which time I've continued to update it. I've had to call a halt for the last month, though. I could send you a hard copy of the cover, which Springer have already issued! R. On Tue, 25 May 2004, Harvey Dubner wrote:

Richard,

Has a new edition of UPiNT been published recently? Is something planned for the near future? Is there more than a Volume 1?

Could you give me a short summary of its hisory? Someone asked me and I was at a loss for facts.

Harvey Dubner