A and S Landscape Materials has been doing business in Marin County as American Soil Products since 1988. A and S Landscape Materials specializes in high quality soil products and natural stone from all over the world. Our goal is to provide our customers with the finest products and the best service available.. A and S Landscape Materials has been doing business in Marin County as American Soil Products since 1988. A and S Landscape Materials specializes in high quality soil products and natural stone from all over the world. Our goal is to provide our customers with the finest products and the best service available.