Ready References
A Guide to Backyard Astronomy
The Art of Using a Telescope
Power and Aperture in Binoculars
Variable Stars Explained
Overview of LabView
Electrometers and Electroscopes
The Severity of an Earthquake
Ready References A Guide to Backyard Astronomy 
The Art of Using a Telescope Power and Aperture in Binoculars Variable Stars Explained Overview of LabView 
Electrometers and Electroscopes The Severity of an Earthquake