The standard research work for the history of glass insulator manufacturing in the United States. While the pricing is very dated, this 2 volume set provides solid reseach into the history of numerous glass companies, CD identification, and a superb color reference. Scarce set, long out of print. These books are in good condition, comb binding is sound but some page edges are frayed. Covers in great condition. Books unmarked and from a smoke free home.

Let's go $60 shipped.