this one explains composting
http://www.primalseeds.org/compost.htm
this one explians whats in those organic amendments in Alphabetic order
http://www.primalseeds.org/npk.htm
this one explians whats in those organic amendments in order of what nutrients. this one is a favorite of mine for when mixing up soils
http://www.primalseeds.org/kpnref.htm
and for offline use i made pdf's for you enjoyment