Original stone trade vintage catalog for THE STRUCTURAL SLATE COMPANY. Main office was located in Pen Argyl, PA. Quarries in Lehigh and Northampton Counties, Pennsylvania. Manufacturers of Slate for Every Building Purpose. Characteristics, grading, surfaces and finishes are discussed in detail. Unbound from a large 1938 architectural catalog, this unique old one page technical brochure would display fantastic matted and framed. A fabulous addition to your retro stone library.