British Standards Document
BS 4978
Visual strength grading of softwood. Specification

https://doi.org/10.3403/30148362U

BS 4978 is maintained by B/518. The current release of this standard is:

BS 4978:2007+A2:2017 Visual strength grading of softwood. Specification

https://doi.org/10.3403/30148362 (published 31/05/2007)

This standard is available from the following sources:

Other historical versions of this standard document also exist:

BS 4978:2007+A1:2011 [current until 30/11/2017]
BS 4978:1996 [current until 31/05/2007]
BS 4978:1988 [current until 15/08/1996]
BS 4978:1973 [current until 30/11/1988]