Michigan Critical Dune Areas

Digital form of maps used in "Designated and Critical Sand Dune Areas" pamphlet. Published by Geological Survey Division in 1996. These are the same areas represented in the "Atlas of Critical Dunes", which was published in February 1989 and is referenced in Part 353, Sand Dune Protection and Management, of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended (NREPA). Learn more about Michigan's Critical Dune Area Program.本数据集为1996年由地质调查部门（Geological Survey Division）发布的《指定与关键沙丘区》（Designated and Critical Sand Dune Areas）宣传手册中所使用地图的数字版本。其涵盖的区域与1989年2月出版的《关键沙丘图集》（Atlas of Critical Dunes）中的对应区域完全一致；该图集已被经修订的1994年第451号公法《自然资源与环境保护法》（Natural Resources and Environmental Protection Act, 1994 PA 451，简称NREPA）的第353部分“沙丘保护与管理”所引用。如需了解密歇根州关键沙丘区项目的更多信息。