Sheet Metal Technology, Industry Information

O*net Online, Sheet Metal Worker
http://online.onetcenter.org/link/summary/47-2211.00

WOIS, Sheet Metal Workers
http://www.wois.org/use/occs/viewer.cfm?occnum=100448

US Dept of Labor, Sheet Metal Workers
http://stats.bls.gov/oes/current/oes472211.htm

Sheet metal and Air Conditioning Contractor’ National Association
http://www.smacna.org/