American Design Drafting Association http://www.adda.org
DRAFTING STANDARDS http://idsdev.mccneb.edu/djackson/default.htm
JOurney Ed Software http://www.journeyed.com/department.asp?NAV=01
National Institute of Metalworking Skills http://www.nims-skills.org
Welding Guide http://www.metalwebnews.com/howto/weld/weld.html