(A government essay on liquid versus solid rocket fuels, and which country uses what.)
(A discussion and list of ROCKET PROPELLANTS)
(An amateur rocketry site, with a Q&A discussing HOMEMADE SOLID ROCKET FUEL.)
You might also want to check out a book here on Amazon, the 2009 edition of "Future Spacecraft Propulsion Systems ..." by Czysz and Bruno.
Let the discussion begin!