SOURCES OF INFORMATION ABOUT TIMBER general public has little idea of our timber supply, and even the manufacturers and users of forest products have no conception of the abundance of information that can be obtained simply for the asking. The Forest Service of the United States Department of Agriculture has for many years collected information upon the forest resources of the United States, and upon the properties and uses of wood, which is freely given to all inquirers. Moreover, the several associations of lumber manufacturers throughout the country freely supply information upon their own particular products.