Calibre Quick Start Guide
John Schember
Audio Fingerprinting with Python and Numpy
Will Drevo
Building Blocks for Theoretical Computer Science
Margaret M. Fleck
Categories for the Working Mathematician
Saunders Mac Lane
Designing Elixir Systems with OTP
James Edward Gray, II, Bruce A. Tate
Designing Elixir Systems with OTP (for Correl Roush)