hi guys. a lot of years ago, i had bought a book by Thomas Bonsall called "firebird, a source book". the book was loaded with info on everything firebird. it helped me while shopping for a bird, showing me the rare, and not so rare options, and also helped by showing what was available on a bird, for the different years. also kept a few of the sellers on the "honest" side of things. anyways, that was many years back, before google. now, the early years (70's, or so) oldsmobiles have caught my eye, and am wondering if there are any good sources to tell all the different models apart. 442/cutlass/supreme/hurst olds/sx, etc. give me a shout if you can help! thx