 Beginning in the same decade, company management began participating in the preservation movement, primarily as a result of pressure from the Save the Redwoods League in San Francisco.Portions of prior PL holdings including the Rockefeller Forest, the world's largest remaining contiguous old growth Redwood Forest to survive, now comprises the core of Humboldt Redwoods State Park.Further developments included recycling of sawdust into the world's first Presto logs.