Official documents, authoritative standard release, the standard discussion inexpensive PDF documents: - AASME B31.3-2012, ASTM F2328M-07(2014), IPC A-610E, AANSI/AGMA 2015-1-A01 (R2008), AWS D14.9/D14.9M:2013, AASHTO R 34-03 (2013), ASHRAE 62.1-2013, MS