National Geographic : 1917 Oct
Buildings Built for Permanence are Built of Concrete Permanent Roads Can Be Built of Concrete Also Concrete has no equal among building materials. Dead loads formerly impossible are carried on concrete beams and flooring; heavy machinery is now operated in top most stories with scarcely noticeable vibration. Time increases the strength of concrete. Our Highways Should be as Lasting as Our Buildings Billions are lost annually in repairing and rebuilding roads which heavy rains and the severe conditions of modern traffic annually destroy. Roads built ofconcrete are moderate in first cost, easy to build, and are permanent-ideallyfit for any traffic at every season. Write today for Bulletin No. 136. It contains facts of interest to every taxpayer. PORTLAND CEMENT ASSOCIATION Offices at ATLANTA DENVER MILWAUKEE SALT LAKE CITY CHICAGO INDIANAPOLIS NEW YORK SAN FRANCISCO DALLAS KANSAS CITY PITTSBURGH SEATTLE WASHINGTON, D. C. "Mention the Geographic-It identifies you."