Original 1977 insulation trade vintage catalog for MINNESOTA DIVERSIFIED PRODUCTS, INC.  Main office and plant were located in St Paul and Rockford, MN.

Manufacturers of RAY-LITE Expanded Polystyrene Building Insulation.

Products include Cold Storage Insulation, Cavity Wall Insulation, Perimeter Subgrade & Floor Insulation and Loose Fill Insulation, all are fully featured. 

Has product images, detailed illustrations, description, applications and specifications provide product info.

Unbound from a large rare 1977 Architectural Catalog File compilation, this unique old eight-page technical brochure would display beautifully matted and framed. Nice cover graphics. A fabulous addition to your retro insulation library.