Scope and Contents Topics and types of documents include letter signed by several congressmen regarding H. R. 2091 to establish concession policies in National Park Service areas; letter signed by several congressmen to consider bills for additions to National Park System; fact sheets; booklets; news clippings; newsletters; journal articles; and maps of Big Thicket National Park, Texas. Correspondents include Sierra Club; John R. Foley; Joe M. Kilgore; Earl F. Landgrebe; National Park Foundation (booklet); and F....