One mile up the trail, where it intersects the Wildwood Trail, visit the moss-covered remains of a stone building erected by the Works Progress Administration in 1936. (Known by locals as the “Stone House” or “Witch’s Castle,” the structure is, in fact, a former restroom.) ...
题目那关Edgar McGregor, a 20-year-old climate activist, spent 589 days picking up litter from Ealon Canyon, which is a part of the Angeles National Forest in southern California.那关 McGregor promised to pick up litter left by visitors while posting his progress on Twitter....
static spatial study of regional forestry input–output efficiency from the perspective of integrated efficiency and used the Malmquist indicator to analyze the developments in regional forestry in dynamic time from total factor productivity change, technical progress change and technical efficiency change. ...