These vintage academic books are great resources for those interested in immunology and human physiology. To use them, simply open the pages and start reading. They can be used for self - study, reference in academic work, or just for general knowledge. When handling the books, be gentle to avoid further damage to the covers which already have some minor issues. After use, store them in a dry and cool place to prevent the pages from yellowing further. Also, keep them away from direct sunlight to maintain the integrity of the paper and covers.