by anarres
The text of each article is licensed CC BY-NC 4.0.
The images come from many different sources - see the text immediately under each image to find out its author, source, and license.
To cite an article, put something like this in a prominent place:
"Dry Stone Walling" by anarres, https://anarres.github.io/AnOutlineOfOrdinaryTechnology/articles/dry-stone-wall/index.html, licensed Creative Commons Attribution-NonCommercial 4.0.
The 'non-commercial' part of the license just means you can't copy and share this where the primary goal is to make money. It will usually be fine to copy and share this as part of a job you get paid for; a teacher giving out copies to students is fine, and adding an article to a presentation or educational website is fine. On the other hand, you definitely cannot make 'An Outline of Ordinary Technology' into an ebook and sell it on Amazon.