Below are a few links where you can buy some of the standards and codes you may need.
the American Welding Society's website (AWS),
the American National Standards Institute bookstore (ANSI),
the American Society of Nondestructive Testing (ASNT),
or the Society of Protective Coatings (SSPC).
The benefit of using a third party supplier is shipping. You can get them in one package and have them in your hand overnight.
If you are interested in leaving your comments on better places to get these standards, then please do!