I am currently looking for this book and CAT worldwide says you all have this: Threshold limit values : discussion and thirty-five year index
We only have this title in print format so this is an item that must be physically checked out. If you are one of our regional campuses students we can send it to your campus for you. If you are a student here in Houston you will be able to check it out yourself from our library. If you only need a few sections from the title, you can photocopy them or scan them inside the library.