Ready References
Basics of Motion Control
AAVSO Observing Programs
Choosing Your First Telescope
Electrometers and Electroscopes
Rocks and Layers
Understanding Celestial Coordinates
Latitude is Everything
Ready References 
Basics of Motion Control 
AAVSO Observing Programs Choosing Your First Telescope 
Electrometers and Electroscopes Rocks and Layers Understanding Celestial Coordinates Latitude is Everything