Thanks! Corrugated? Isn't that the "wavy" siding? It was quite "wavy" almost like the heavier fiberglass sheeting that you can buy at home stores. I actually liked the look. I have seen many over the years but never paid close attention and now, can't get away to look at any. Winter is already too long and just starting.
I did just look through the 1977 brochure, loved it! It has a "sandwich" but doesn't use the word "laminated" but I don't know if they even called it that way back. We have a used-to-dealer about 50 miles north so when we get up there and check for used, they should be a good information source.