Insulator History & Guide Books - By John & Carol McDougald - ( 2 ) Volume Book Set - This two volume set totals approx. 500 pages and is in - just like new condition. These books measure 8 1/2" by 11" and are loaded with great photo's, patents and other historical information on insulator manufacturing companies. The price is $39.00 with free domestic shipping included. Money Order or Personal Check OK.