I've been working with threads and fibers for many years, but am new to weaving (rigid heddle) yarns and names. I am having problems understanding and interpreting yarn names/weights. Worst of all, I can't figure out how to look for the info in books, etc. For example: in an "8/2 cotton", what does the "8/2" mean? Does anyone know of a good book that might have reference info like this? THANKS?