I was in Beijing last week and had the opportunity to treasure hunt on Taobao. I obtained a large quantity of Go materials to help my compilation of Chinese and Korean games in 1980's and 1990's. Among things I found are 4 volumes of Korean yearbooks. What's unusual is that they are not formal published books - they appear to be (rather high quality) reproductions. I have no idea who produced these or for what purpose, or if they are authorized copies. Here is a photo