Add to ORKGThere are plenty of books that are sufficiently popular that they are reprinted many times. Some are published in 2 nd, 3 rd, 4 th or even 20 th editions. A number of them will be altered slightly or significantly and are therefore said to be “revised ” editions. Very few books, however, merit and even fewer succeed in being reproduced in “anniversary ” editions. To be thus honoured by one’s publisher is to be given a tremendous stamp of approval. Even if the gesture is no more than a clever marketing trick, the claim is implicitly made that the book matters. It is advertised as being important. Its special reproduction implies that it may have offered fresh insights, changed people’s minds, provided important new information or inspired re...