You can earn a 5%
commission by selling Appendixes to the Fifth Edition of Dana's Mineralogy: Appendix I., 1868-1872; Appendix II., 1872-1875; Appendix III., 1875-1882 (Classic Reprint)
on your website. It's easy to get started - we will give you example code.
After you're set-up, your website can earn you money while you work, play or even sleep!
You should start right now!