These books are some of the earliest collector guides in this hobby. Date 1969,One of these books were written by John C Tibbitts and is illustrated with drawings and text of most insulators and insulator patents that had been given a CD# by then, the second is a 1973 price list of what pieces went for back then, and the third book is 800 insulators illustrated and dated 1971.These books are a great go with for someone who wants to keep early hobby literature along with their collection of insulators. Books are in used but decent shape. $6 + shipping for all 3.Media mail is the cheapest way to go.