Ready References
Beginner's Corner, Jun. 1939
Spectral Types of Stars
The Stellar Magnitude System
Making Variable Star Observations
Overview of LabView
Coating of Surfaces: Evaporation and Sputtering
Fossils and Rocks
Ready References 
Beginner's Corner, Jun. 1939 Spectral Types of Stars The Stellar Magnitude System 
Making Variable Star Observations Overview of LabView Coating of Surfaces: Evaporation and Sputtering Fossils and Rocks