There are numerous federal agencies that have materials relevant to engineering. Here are some of the major agencies that sponsor computer science and/or engineering research. See the National Laboratories box for links to subsidiary locations.
National Science Foundation (NSF)
The DOD sponsors research in variety of fields. This box lists a few of the DoD science & technology sources.
The US government operates several national laboratories that conduct research of interest to researchers in computer science, engineering, physics, and more. This box includes links to agencies that operate national laboratories.