These books are great for those interested in the genera of flowering plants. You can use them for study, research, or just for personal interest. When handling the books, be gentle as they are from 1967 and have some signs of wear. To maintain them, keep them in a dry and cool place away from direct sunlight. If you need to clean the dust jackets, use a soft, dry cloth. Avoid using any harsh chemicals or cleaners on the books. When reading, try not to bend the pages too much to keep the bindings tight.