While on a 100 mile drainage survey for archaeological potential on the
Passaic River in New Jersey about 20 years ago we came upon a shipyard in
South Jersey near Newark I think. In it was said to be some of the last
steel "Liberty" class ships being broken up for steel scrap. I've read in a
General Motors sponsored publication, American Heritage's "Invention and
Technology" that the fastest assembled Liberty ships were assembled out in
the Pacific Northwest. They were also built in parts no way near water and
assembled at the waters edge. This is the first I've heard of concrete.

George Myers