These are links to the areas of the National Park Service and Smithsonian Institution's huge websites that pertain most closely to archaeology and anthropology.
National Park Service:
NOTE that the Library ceased receiving new tangible government documents in Spring, 2016, and withdrew large numbers of tangible documents during the previous year.
The Library has some of the National Park Service's publications in these areas, especially if they pertain to sites in Texas or the Southwest. Here are some NPS series (note that Library has substantial holdings only in the Handbooks series):
The Library only has selected items in print from these Smithsonian series, but there are links to electronic versions in the Library Catalog (they can be searched by these classification numbers as well as author, keyword, etc.):