Khan lectures became my Bible of Radiation Oncology , an Older version
I could read this textbook on my own during the multiple racism attacks I was facing in Radiation Oncology. I was not allowed in lecture theatres and lectures by my racist professor and colleagues, I started reading this book as it was a free copy on google, before the new colorful Khan
This has no colors and has less new technology on Radiation Treatment, a good read for lectures if you can't afford or dont want to spend money or want to just browse to get a feel, it's now too outdated but good keeps