Explanatory notes
… birch ( Betula spp. ), cherry ( Prunus spp. ), chestnut ( Castanea spp. ), elm ( Ulmus spp. ), eucalyptus ( Eucalyptus … ), maple ( Acer spp. ), oak ( Quercus spp. ), plane tree ( Platanus spp. ), poplar and aspen ( Populus spp. ), robinia … perforated, cut or formed to shapes other than square or rectangular and whether or not they have been worked at the …