"Slate Roofs 1926 is a modified reprint of the original work, Slate Roofs, published in 1926 by the National Slate Association and now in the public domain. It includes an addendum that incorporates 2017 slate roof installation, repair, restoration, and maintenance guidelines originally published by the Slate Roofing Contractors Association of North America, Inc., of which Joseph C. Jenkins is founder and Executive Director. It also includes excerpted pages from the Slate Roof Bible, 3rd Edition, authored and published by Joseph C. Jenkins in 2016"--