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Subject
- Scientific apparatus and instruments3
- Scientific illustration6
- Scientists--Biography1
- Sodium--Spectra1
- Solar eclipses1
- Spectrum analysis9
- Spectrum, Solar1
- Stars--Spectra2
- Stevens Institute of Technology1
- Strontium--Spectra1
- Sun3
- Sun--Prominences1
- Sunspots1
- X-ray spectroscopy1
- Young, Charles A. (Charles Augustus), 1834-19081