You can earn a 5%
commission by selling Elevation and Stadia Tables: For Obtaining Differences of Altitude for All Angles and Distances, Horizontal Distances in Stadia Works, Etc., with All Necessary Corrections (1901)
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!