2 Volume set of A History and Guide to North American Glass Pin type Insulators John & Carol McDougald's 1990 set, Volume one of A History and Guide to North American Glass Pin type Insulators and has over 170 pages of company histories plus color photos of insulators. The Volume 2 has 325 pages of pictures (not drawings) and listings of all known North American insulators at the time of the publication... $40.. plus postage..... Don't wait for a sale, it's not going to happen. ** REMEMBER No Buyers premium to pay!!!! NO Bidding!!!!