With the TOPO! map of Iowa, National Geographic has taken the interactive topographic map experience to a new level. By combining its own standard-setting maps with the high-quality scanned versions of the actual paper USGS topographical maps, the National Geographic TOPO! State Series offers five levels of map detail that is unprecedented in its accuracy. Professional and weekend hikers alike will be amazed at how indispensable TOPO! will quickly become in the back country.