FBI: Potential Terrorist Use of Almanacs: "Almanacs, available both in print and online, provide comprehensive information on a variety of topics, including government, geography, vital statistics, the economy, health matters, science and technology, weather trends, and tourism. Information commonly found in almanacs that may be exploited for terrorist use includes profiles of U.S. cities and states and information on geographic and structural features such as waterways, bridges, dams, reservoirs, tunnels, buildings, and landmarks. This information is often accompanied by photographs and maps."