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Discovery of Oxygen, Part 2
Free
Carl Wilhelm Scheele
Discovery of Oxygen, Part 2
A Plan for Securing Observations of the Variable Stars
Free
Edward C. (Edward Charles) Pickering
A Plan for Securing Observations of the Variable Stars
The Number Concept: Its Origin and Development
Free
Levi L. (Levi Leonard) Conant
The Number Concept: Its Origin and Development
Heroes of Science Chemists
Free
M. M. Pattison (Matthew Moncrieff Pattison) Muir
Heroes of Science Chemists
A New Bat (Genus Myotis) From Mexico
Free
E. Raymond (Eugene Raymond) Hall, Walter Woelber Dalquest
A New Bat (Genus Myotis) From Mexico
Free
A. M. (Arthur Mason) Worthington
The Splash of a Drop
Free
Robert J. Nemiroff, Jerry T. Bonnell
The Square Root of 6