O Scale Max Gray Brass "Spotter's Guide" 4 Vols. Set plus

Like new condition Max Gray "Spotters Guide" 4 volume spiral bound set showing MG/US Hobbies O scale brass model locomotives and freight cars. 2 locomotive guides with left and right side pictures and one freight car guide with pictures;plus comments on variations in each. Also includes "Catalgue #4" with compiled newsletters and announcements. PLUS 8 separate data sheets issued by Max Gray on:locomotive maintainence,lubrication,news and the sheet where Max Gray offers his business for sale.  please email questions