At the time NFMA was written, there were conflicting interests in regards to proper forest management. The major player of national forest management at the time was the timber industry. In a post World War II economy, the demand for timber skyrocketed with the housing boom and people were recreating on public lands more than ever before. Visitors to national parks rose from 50 million in 1950 to 72 million in 1960. The Sierra Club and other conservation groups were also fighting for preservation of natural landscapes. The Multiple-Use Sustained-Yield Act of 1960 made it clear that the Forest Service had to manage for non-timber values, like recreation, range, watershed, wildlife and fishery purposes, but it was not until NFMA that these uses were embodied by the forest planning process.