I occasionally receive printed catalogs specific to Antiquarian Science from Jeff Weber Rare Books , and I always find them fascinating. Not all of the items are expensive, but the more interesting of them surely are. For example, the Antiquarian Science catalog for Winter 2007 lists a book entitled The First Six Books of The Elements of Euclid in which coloured diagrams and symbols are used instead of letters for the greater ease of learners by Oliver Byrne, published in London in 1847. Jeff Weber Rare Books is selling a copy of this for $9,500. Some of the most expensive items in the recent catalog are for periodicals rather than books: An offprint from a 1958 paper by John von Neumann from the Annals of Mathematics for $200. The 1950 issue of the British journal of philosophy Mind containing Alan Turing's famous paper "Computing Machinery and Intelligence" (in which he proposed what has come to be known as the Turing Test) for $1,500. The 1953 issue of Nature that contains the paper Read More...