Concrete stamps fall into two categories: those issued for the cement industry and those depicting concrete construction. The United States has never issued a cement stamp but many foreign nations have issued such stamps in recognition of the economic importance of the industry. A good symbolic design was featured by Egypt in 1958 as part of a series depicting a local industries. Another good symbolic- possibly the only one to show a bag of cement- was issued by the Koreans in 1963. Cement plants are a popular stamp design in Eastern Europe. A plant at Cheim, Poland, is shown on an elongated Polish stamp of 1964 issued to commemorate the twentieth anniversary of the Polish People's Republic. Russia has issued a number of cement stamps. The one here shows the plant at Belgorod. Cement plants and trucks, one empty and one full, are on a 1967 stamp of Afghanistan issued to publicize industrial developments. There are many more such stamps to be dug out form catalogs or from lists compiled by fellow collectors. In the category of construction there is a fairly large number of stamps available. Some, like the Viet Nam stamp issued to publicize the rebuilding of Hue, show both the materials and the structures; others, like the modern design issued in 1971 by Lesotho, are symbolic of construction. The word construction can be seen in small letters in the lower, hand corner of this stamp. Other stamps can be found to show combination both construction and the finished product.