Row 1. chain 70. (depending on the length of your book, and add 1 more inch of chain to be attached at the back of your book with tape)
Row 2. 3ch-2dc-3ch, sl st, 3ch-2dc-3ch, sl st, 3ch-2dc-3ch, sl st.
Row 3. sl st all through the remaining ch. Tear off.
Row 4. Attach with tape at the back of the book. Secure bookmark.