Not everything is online, and sometimes we still need to dig out the facts the old-fashioned way.
This great poster, developed by the California Genealogical Society (Oakland, California) is available for sale.
I saw it at the Southern California Genealogical Society Jamboree 2009 in June, but forgot to get my own copy. I'll pick one up at Jamboree 2010 (June 11-13, 2010).
It was developed by CGS volunteers. Read more about the project here.
Purchase the 11-inchx17-inch poster for $13 (including tax and US postage), two posters are $23, and three are $33 (buy three and they'll give you another one for free). Posters are sent in a mailing tube. If you'd like a poster mailed elsewhere than in the US, email the CGS for information.
To purchase a poster, send a request and payment (US check) to:
The California Genealogical Society and Library
Oakland, CA 94612-3031