Standards, Specifications, Protocols, Methods, and Codes

A source for industry standards, standard methods, specifications and codes. Not comprehensive!

CFR (Code of Federal Regulations) -- United States

US Military Specs and Standards

The Defense Supply Center Columbus (US) provides free access to a large number of US military specifications, standards, and drawings.  These include:

Federal Documents and Legislative Materials

Historical Specifications from the National Bureau of Standards

The government states it best:

Statement on Federal Specifications