Ready References
Signal Conditioning and Data Acquisition Overview
Celebrated Variable Stars
Introduction to Fossils
Laboratory Optical Work
Age of the Earth
Fossils, Rocks, and Time
Major Divisions of Geologic Time
Ready References 
Signal Conditioning and Data Acquisition Overview 
Celebrated Variable Stars Introduction to Fossils 
Laboratory Optical Work Age of the Earth
Fossils,
Rocks, and Time Major Divisions of Geologic Time