For "History of Photography":
http://inventors.about.com/od/pstartinventions/a/stilphotography.htm
http://photo.net/history/timeline
http://www.photography.com/articles/types-of-photography/history-of-photography/
For "Composition":
http://www.wikipedia.org/
http://www.pentalonline.com/docs/msds/MSDS_Slate.pdf
http://www.smt.sandvik.com/en/materials-center/material-datasheets/strip-steel/sandvik-13c26-razor-blade-steel/
http://www.scientificpsychic.com/fitness/fattyacids.html
http://www.fpl.fs.fed.us/documnts/pdf1984/pette84a.pdf
http://cotton.missouri.edu/Classroom-Chemical%20Composition.html
http://www.rubbercompound.info/basic-rubber/the-basic-compound-formula
http://www.fao.org/wairdocs/tan/x5916e/x5916e01.htm
http://www.cleanairpurewater.com/minerals.html
For "Glossary":
http://dictionary.reference.com/
http://www.merriam-webster.com/
http://www.photography.com/articles/types-of-photography/history-of-photography/
For "How Cameras Work":
http://www.explainthatstuff.com/how-film-cameras-work.html
http://electronics.howstuffworks.com/film6.htm
For "Diagrams":
http://photo.tutsplus.com/tutorials/post-processing/step-by-step-guide-to-developing-black-and-white-t-max-film/
http://inventors.about.com/od/pstartinventions/a/stilphotography.htm
http://photo.net/history/timeline
http://www.photography.com/articles/types-of-photography/history-of-photography/
For "Composition":
http://www.wikipedia.org/
http://www.pentalonline.com/docs/msds/MSDS_Slate.pdf
http://www.smt.sandvik.com/en/materials-center/material-datasheets/strip-steel/sandvik-13c26-razor-blade-steel/
http://www.scientificpsychic.com/fitness/fattyacids.html
http://www.fpl.fs.fed.us/documnts/pdf1984/pette84a.pdf
http://cotton.missouri.edu/Classroom-Chemical%20Composition.html
http://www.rubbercompound.info/basic-rubber/the-basic-compound-formula
http://www.fao.org/wairdocs/tan/x5916e/x5916e01.htm
http://www.cleanairpurewater.com/minerals.html
For "Glossary":
http://dictionary.reference.com/
http://www.merriam-webster.com/
http://www.photography.com/articles/types-of-photography/history-of-photography/
For "How Cameras Work":
http://www.explainthatstuff.com/how-film-cameras-work.html
http://electronics.howstuffworks.com/film6.htm
For "Diagrams":
http://photo.tutsplus.com/tutorials/post-processing/step-by-step-guide-to-developing-black-and-white-t-max-film/