>the color book was intended as an educational guide. The irony being there was only a single copy that was probably seen by very few eyes. If one of someone's

>the color book was intended as an educational guide. The irony being there was only a single copy that was probably seen by very few eyes. If one of someone's life's works is very particular, and is further documented in such a detailed way it could only be a personal achievement itself, you've got to figure it's not going to be very common to find someone else who could use the document any time soon. In this case where each color page may be worth a thousand words or something like that. They would first have to make it part of their own life's work in pursuit of that subject to begin with. Which may not be likely to happen during the author's lifetime anyway. So why would they need more than one copy, especially when reproduction itself could be a much more unlikely hurdle to overcome compared to manuscripting? These are the types of books most all of which are usually lost. Leaving us with the slim pickings we have today. If only there were better preservation & archiving over the millennia. Naturally the fewer the copies, and the less-rapid international communication at the time, the more centuries you would expect it to take before advanced people like that or their reference document gain some kind of worldwide recognition.