The Dictionary of Glass & Ceramic Insulators is a great reference for identifying strains, cleats, brackets and lots of the odd ball stuff. Milholland's Bicentennial Edition (1976) was the bible of the hobby until the McDougald books in 1990. The 1991 McDougald Price Guide was the follow up to their two volume 1990 history and guide. Grandpa Mac's Antique Insulator Emporium 1997....where you could buy porcelain insulators for as low as 39 cents a pound! All this for $25.00 and that includes shipping (media rate) to your US address. PayPal, friend mode, or check