Ready References
A Guide to Backyard Astronomy
The Art of Using a Telescope
Power and Aperture in Binoculars
Variable Stars Explained
Making Variable Star Observations
Molding and Casting
Easy Prototyping
Ready References A Guide to Backyard Astronomy 
The Art of Using a Telescope Power and Aperture in Binoculars Variable Stars Explained Making Variable Star Observations 
Molding and Casting Easy Prototyping