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barrysloateDan is correct. You can't change, but you can add anything you want.
There were two editions issued in 1906: the numbered version of 250 copies, and an unnumbered one. I always assumed the numbered version was first, but it is possible both editions ran simultaneously, with the numbered copies offered to friends of the author, and the unnumbered copies to the general public. It was also reprinted in 1907 and 1908.