Websites that = useful.

Pesticides:
http://tierneylab.blogs.nytimes.com/2007/06/06/synthetic-v-natural-pesticides/

Mandava, N.B. (ed.). 1985. Handbook of natural pesticides: Methods. Vol. I Theory practice, and detection. CRC Press, Boca Raton, FL.?

http://www.ncpa.org/studies/s214/s214c.html

http://coopext.colostate.edu/4DMG/PHC/psticid2.htm

Aztecs:
http://www.indians.org/welker/aztec.htm <--Ugly text. D:

http://www2.truman.edu/~marc/webpages/nativesp99/aztecs/aztec_template.html