Curves and Their Properties by Robert Yates
This is Robert Yate's Curves and Their Propertes book, written around 1952.
Use the side panel for navigation.
Download the whole thing for $10. (Includes all images, html, and single PDF version) Use the paypal button below. In the comment field, put “plane curve yates book”. I'll email you the download link. Make sure your email address is included and correct.
If you have a question, put $5 at patreon and message me.