These books are great resources for those interested in nuclear physics. To use them, simply open and start reading. You can mark important pages with bookmarks if you like. When handling the books, try to keep your hands clean to avoid adding more soiling. Since the covers have some wear, be gentle when opening and closing them to prevent further damage. Store the books in a dry and cool place to avoid additional aging of the text blocks. If you notice any loose pages, you can use some archival - quality glue to re - attach them carefully.