Ready References
A Guide to Backyard Astronomy
The Art of Using a Telescope
Power and Aperture in Binoculars
Variable Stars Explained
Essential Technologies for Making Accurate PC-Based Measurements
Molding and Casting
DNA Fingerprinting
Ready References A Guide to Backyard Astronomy 
The Art of Using a Telescope Power and Aperture in Binoculars Variable Stars Explained Essential Technologies for Making Accurate PC-Based Measurements 
Molding and Casting DNA Fingerprinting