(Ski Camelback), Blue Knob (Ski Blue Knob), and Denton Hill (Ski Denton). (Two other state parks had commercial ski operations in the past Laurel Mountain (from 1939 to 2005) and Black Moshannon (from 1965 to 1982).) Two parks are operated by other governmental bodies: Hillman (managed for hunting by the Pennsylvania Game Commission) and Norristown Farm (operated by the Montgomery County Department of Parks). Three parks are operated by other organizations: Susquehanna (operated by the Williamsport/Lycoming Chamber of Commerce), Prompton (operated by non-profit "Friends of Prompton"), and Salt Springs (operated by non-profit "Friends of Salt Springs"). b. The Pennsylvania counties without state parks as of 2023 are: Armstrong, Juniata, Lehigh, Montour, and Snyder counties. Two of these counties are sites of former state parks: Crooked Creek in Armstrong County, and Snyder-Middleswarth in Snyder County. c. The goal of having a state park within 25 miles (40 km) of every resident was set by Maurice K. Goddard (Secretary of the Pennsylvania Department of Forests and Waters, and then of the Department of Environmental Resources from 1955 to 1979). d. The seven National Natural Landmarks at least partly within current state parks (with the park name in parentheses, if different) are: Cook Forest, Ferncliff Peninsula (Ohiopyle), the Glens Natural Area (Ricketts Glen), Hickory Run Boulder Field (Hickory Run), McConnells Mill, the Pine Creek Gorge (includes Colton Point and Leonard Harrison), and Presque Isle. One National Natural Landmark, Snyder Middleswarth Natural Area, is a former state park. e. The date of establishment for many Pennsylvania state parks is not always clear, especially for parks developed from state forest property. As an example, consider Upper Pine Bottom, which, as of 2012, is a picnic area surrounded by Tiadaghton State Forest. These state forest lands were acquired by the state by the early 1900s, the site was "Upper Pine Bottom Class B Public Campground" by 1924, the CCC built a pavilion there in 1936 (which is no longer extant), but it was not officially transferred from the Bureau of Forests to State Parks until 1962. f. This park was one of twenty-five chosen by the Pennsylvania Bureau of Parks for its "25 Must-See Pennsylvania State Parks" list. g. This park has one or more historic sites or districts on the National Register of Historic Places. h. There have been a considerable number of changes in Pennsylvania's categorization of its state parks and other protected areas