I’m making every attempt to publish only content I’ve created with a few supporting photos taken by more talented friends. That said, I’ve occasionally used symbols and vintage artwork I believe to be in the public domain for non-commercial use.

Here’s where I found what I wanted.

• Pretty stuff at http://thegraphicsfairy.com/
• Math symbols at http://etc.usf.edu/clipart/
• Words and how to use them. When I give a definition, it probably comes from https://www.merriam-webster.com/