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CS Principles: Big Ideas in Programming
by Mark Guzdial and Barbara Ericson, remixed by Jeffrey Elkner
Hands-on introductory computer programming using Python 3.
How to Think Like a Computer Scientist: Learning with Python
by Peter Wentworth, Jeffrey Elkner, Allen Downey, and Chris Meyers
An introductory computer science text book using Python.
Lessons in Electric Circuits
by Tony R. Kuphaldt
A free series of textbooks on the subjects of electricity and electronics
