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Light, Physical Science (matter). Portage & Main Press. p. 39. ISBN 978-1-894110-63-1. Archived from the original on 2014-01-01. Retrieved 2009-06-28. Christner...

Chapter 5: The Colors of Light. Portage & Main Press. p. 39. ISBN 978-1-894110-63-1. Retrieved 2009-06-28. Kenneth G. Libbrecht (2006-09-11). "Guide to...

Chapter 5: The Colors of Light. Portage & Main Press. p. 39. ISBN 978-1-894110-63-1. Retrieved June 28, 2009. Warren, Israel Perkins (1863). Snowflakes:...