Computer Science textbooks that are freely available online
By no means a textbook, just a barely-edited book-length anthology of primary sources I put together, but let me plug my own:<p><i>Finite of Sense and Infinite of Thought: A History of Computation, Logic and Algebra</i><p><a href="https://pron.github.io/computation-logic-algebra" rel="nofollow">https://pron.github.io/computation-logic-algebra</a>