source for frame diagrams

Years ago I was working on (gasp) an f body (no, not a fire chicken, and though they're mistaken for them, certainly not a nova.... )
I went to a local body shop and they had a rack of red books, in each was all the frame charts for common vehicles of a given year. He let me borrow it, "keep it til you're done"..... I was replacing a frame rail in my volare at the time.