I just read a very interesting book. It is “JAPANESE GOLDFISH, Their Varieties and Cultivation” by Hugh M. Smith, U.S. Commissioner of Fisheries. It is only 92 years old (printed 1917). If you take into account the age of the book and ignore the vastly outdated material (things about steam ships and all), it is really interesting. It deals extensively with Wakin, Ryukin, Ranchu, Oranda, Demekin, Deme-Ranchu, Watonai, Shukin, Shubunkin, and Kinranshi. I was amazed how much useful information there is on breeding, feeding, and raising fry. If any one is interested (it is less than 100 pages) it is at:
http://www.archive.org/details/japanesegoldfish1917smit