The Philosophy of Mathematical Practice
Paolo Mancosu
Fix It and Sail
Brian Gilbert
Microsoft Excel 2019 Pivot Table Data Crunching
Bill Jelen & Michael Alexander
Microsoft SQL Server Notes for Professionals
GoalKicker.com
Endlessness' Names
Georges Ivanovich Gurdjieff
Multivariable Calculus with Mathematica®
Robert P. Gilbert
Multivariable Calculus with Mathematica
Robert P. Gilbert & Michael Shoushani & Yvonne Ou