1. Introduction to the Electromagnetic Spectrum: https://science.nasa.gov/ems/01_intro
2. Tour of the Electromagnetic Spectrum, Third Edition, NASA, 2016: https://smd-prod.s3.amazonaws.com/science-pink/s3fs-public/atoms/files/Tour-of-the-EMS-TAGGED-v7_0.pdf
3. Max Millennium program, ground-based solar telescopes: http://solar.physics.montana.edu/max_millennium/obs/GBO.html
4. National Solar Observatory: https://www.nso.edu/
5. Solar Telescopes: https://en.wikipedia.org/wiki/List_of_solar_telescopes