Chapter 91: Papermaking Ice-Making Method

nes scattered everywhere were worth looking at, they still patiently waited for Yang Lin.Yang Lin was looking very seriously at it. He took a chisel and chipped off a small piece, carefully examining...ows how to refine steel, and is familiar with gypsum, coal, and saltpeter... You don't expect me to believe these are all things learned from books, do you I... honestly don't know which book contains...