Shirley Biladeau from the Idaho Commission for Libraries shared that WebJunction has a new course "SHELVING WITH NLM". The course objective includes how to accurately read shelves and properly file materials according the NLM standards.
You need to create a WebJunction account and access the course via the WebJunction Idaho home page. Call Shirley for more information 208-639-4149.
I took the class, it is too basic for a librarian but just perfect for volunteers who might be returning books to your shelves.