From the record
“The Long Lake Outdoor Center, also known as the Long Lake Group Camp Historic District, is a recreational facility located at 10370 Gun Lake Road in Yankee Springs Township, Barry County, Michigan, United States. It was listed on the National Register of Historic Places in 1996.”
Wikipedia article Long Lake Outdoor Center, CC BY-SA 4.0.
One of 9 National Register listings published here for Barry County · listed in 1996 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service

