Older Caddy's, which is which?

I'd like to understand the whole range of cars that Cadillac used to produce. For example, my car, the '76 Calais (which used to be the 62/6200, right?) was the 'entry level' model and was available as a coupe or sedan...next came the DeVille, again available as a coupe or sedan but with better trim and more equipment than the Calais/62. After that I'm not so sure exactly where the Fleetwoods, Broughams and Eldorado's fit in. Can it be easily explained or is there a 'site or book any of you could reccommend?
 
Thanks, Andy
 
 

Try this link , 1900 to now.
 
http://www.motorera.com/cadillac/cad1900/1903/CAD03S.HTM