A web site at Ohio State University also gives versions of the CTC data derived by Thomas Chan from the Unicode tabulation, PRC version in GB coding, the Taiwan version in Big 5 coding. Another version of the CTC is available on the web, courtesy John Savard. It differs even more from the above 3 versions. Unfortunately, Savard has not been to supply any precise source for his data. The CTC has remained in print pretty much all through the 20th century.
Library catalogues list many different editions.
I do not know if it is still in print. It has two sections. The first is arranged in pronunciation order, showing the Chinese character, code number, and Korean pronunciation. One page of an unnamed edition of the CTC is reproduced on p.138 of Alan Stripp's Code Breaker in the Far East . It shows, in addition to the 4 digit code numbers, three letter code trigraphs.