Of birch (betula spp.), of which the smallest crosssectional dimension is 15 cm or more
Birch "betula spp." in the rough, of which any crosssectional dimension is >15 cm, whether or not stripped of bark or sapwood, or roughly squared (excl. sawlogs; wood in the form of railway sleepers; wood cut into beams, etc.; wood treated with paint, stains, creosote or other preservatives)
Sawlogs of birch "betula spp.", of which any crosssectional dimension is >15 cm, whether or not stripped of bark or sapwood, or roughly squared