The third and “special” editions have been replaced by the fourth edition. For standard language and library problems; I recommend TC ++ PL4 over TC ++ PL3. However; the chapters on design and software problems in TC ++ PL3 have been left out of TC ++ PL4 to keep the page count more manageable.
The “special edition” is the hardcover version of the third edition. It differs from the first impressions of the third edition in approximately 1;000 corrections and clarifications; in two new appendices (just over 100 pages; also available online; see below); and by an improved index. The only difference between the current impressions of the special edition and the third edition is the cover (and the price difference implied by that stronger cover). See also my frequently asked questions.