I have no idea if this should be in this category or if it should just be in the bookbinding section....anyways here is the next part of my basic bookbinding resources.
This is the first part (of 3) on the grain of bookbinding materials.
It may not seem that important but if you want your books to last the test of time this information is like gold
See basic bookbinding equipment here:[link]
and paper weights here: [link]