Norwegian domestic truss designs (a justification of the use of certain designs made to Norsk Standards 446 and 447 using T300 grade timber, for use in British conditions with S2-50, S2-65 and S1-50 grade timbers) /
Collins, J. E.
High Wycombe :  Timber Research and Development Association, 
1973.
"E/TR/29".
Trusses.