Valuable notes and data are permanently secured in these hardcover, case-bound books - important for documenting research. Nalgene™. Books have a thick polyethylene cover, uncoated PolyPaper pages, and are completely waterproof and extremely chemical resistant. 100 pages (50 sheets) are numbered and printed with a fine green 1/4" grid or horizontal lines. Pages include spaces for dates and signatures of workers and witnesses, necessary documentation for securing patent protection. Other pages include instructions for keeping research records, table of contents, and a page for issuing the notebook.