Tihkal
On line version of Tryptamines I Have Known And Loved: The Chemistry Continues, By Alexander and Ann Shulgin - An overview of more than hundred tryptamines (psilocybin is a tryptamine) containing lots of substances with psychedelic properties.

Pihkal
On line version of Phenethylamines I Have Known And Loved: A Chemical Lovestory, By Alexander and Ann Shulgin - An overview of more than hundred phenethylamines (mescaline is a phenethylamine) containing lots of substances with psychedelic properties.