He didn't. Instead, Bryan linked to his own lecture notes on discrimination. Am I upset? Hell no, because his notes are magnificent. Go to this link and you will see that he has taught a wide range of courses and has detailed notes on each. If you wanted a high-level, rigorous, fact-filled education in economics, undergrad or grad, and wanted to spend virtually zero money, you would do well to spend hundreds of hours going through those notes. He has taught undergrad courses in micro, macro, labor, industrial, organization, and public choice. Bryan has taught graduate courses in public choice, public finance, macro, micro, monetary, and even econometrics.
Moreover, he includes homework sets and answer keys to those sets.
Here's an example of a homework problem from the first homework set in his undergrad labor econ course:
XIII. Your market wage is $20/hour. Should you value your time at more than $20/hour while vacationing in a foreign country?
When I was 19 and had graduated as a Math major (or, as we said in Canada, a Maths major) from the University of Winnipeg, I took a year off and worked my way through the Journal of Law and Economics for 4 hours every weekday morning. If magically I were 19 today and wanting to teach myself economics, I would combine that with working my way through Bryan's notes.