Hi there, we've noticed you are using a computer with an outdated browser and/or operating system that does not allow for secure online shopping. Please call South Dakota Magazine at 800-456-5117 to place your order by phone or if you have any further questions. We apologize for the inconvenience. - Heidi Marsh, Marketing Director South Dakota Magazine, Yankton, SD Karl Emanuel, a geologist with the Black Hills National Forest, will discuss caves and karst systems in the Black Hills.

http://www.southdakotamagazine.com/event?eventTitle=preservation-thursday-black-hills-caves-and-the-karst-systems-of-the-black-hills--1694674800--7561

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