I found the following site somewhat useful, and it certainly demands further study. It's a list of various essential oils, together with their contents.
(http://www-ang.kfunigraz.ac.at/~katzer/engl/generic_frame.html?spice_small.html%5Burl)
I took the liberty of fixing this for you, make sure to look in the FAQ on the hive so you can correctly provide links
http://www-ang.kfunigraz.ac.at/~katzer/engl/generic_frame.html?spice_small.html (http://www-ang.kfunigraz.ac.at/~katzer/engl/generic_frame.html?spice_small.html)