Ready References
A Guide to Backyard Astronomy
The Art of Using a Telescope
Power and Aperture in Binoculars
Variable Stars Explained
Introduction to Partial Differential Equations
Introduction to Object-Oriented Software
Molding and Casting
Ready References A Guide to Backyard Astronomy 
The Art of Using a Telescope Power and Aperture in Binoculars Variable Stars Explained 
Introduction to Partial Differential Equations Introduction to Object-Oriented Software 
Molding and Casting