The Paper Barn Catalog 2014 - page 4

This product guide contains notations for products that meet registered
environmental standards or carry third party certifications. Products that
contribute to building certification programs are noted in addition to those that
contain sustainable attributes such as recycled content. At the end of many
SKU descriptions, look for an indicator that corresponds to that product’s
certification or associated attribute.
Sustainable Products
I,II,1,2,3 5,6,7,8,9,10,11,12,13,14,...458