An easy way to get way ahead of me in knowledge
of Citrus is to go into a library and read up on the
truly amazing and informative articles that are
contained in the old California Citrograph publications.

Note: several of the older published books on Citrus
such as the Walton B. Sinclair series of books cite
articles from these publications as California Citrog.
An example of such a citing is listed below.

HODGSON, R. W., and EGGERS, E. R. Rootstock influence
on the composition of citrus fruits. California Citrog. 23: 499, 531. 1938.

Thanks to Millet, JoeReal and a few others that
have jarred me into becoming interested into the
larger world of Citrus again, I now wish I had
every one of these publications on hand. Below
is a link to several University libraries that carry
the California Citrograph. Hopefully the content
within the individual links are still current.

California citrograph. [WorldCat.org]

http://www.worldcatlibraries.org/oclc/1771141&tab=holdings?loc=95341#tabs

Jim