The Atom Builder Guide to Elementary Particles
http://www.fnal.gov/pub/inquiring/matter/madeof/
What is the world made of?
http://www.shef.ac.uk/physics/teaching/phy304/propquark.html
Properties of Quarks
http://scienceworld.wolfram.com/physics/Quark.html
http://archive.ncsa.uiuc.edu/Cyberia/Cosmos/QuarkSoup.html
Quark Soup - The Elementary Particle Era