Backing ply 70, which is preferably of {HEAD ~ new wood} of {TAIL ~ the same specie} as surface ply 62 
of
Backing ply 70 , which is preferably of { HEAD ~ new wood } of { TAIL ~ the same specie } as surface ply 62
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH