Ready References
Signal Conditioning and Data Acquisition Overview
Introduction to Partial Differential Equations
Fields of Gravitation
AAVSO Observing Programs
Latitude is Everything
Easy Prototyping
Introduction to Fossils
Ready References 
Signal Conditioning and Data Acquisition Overview 
Introduction to Partial Differential Equations Fields of Gravitation 
AAVSO Observing Programs Latitude is Everything 
Easy Prototyping Introduction to Fossils