HTS Code 4802.57 - Uncoated paper and paperboard, of a kind used for writing, printing or other graphic purposes, and non-perforated punchcards and punch-tape paper, in square or rectangular sheets with one side 435 mm or with one side = 435 mm and the other side 297 mm in the unfolded state, not containing fibres obtained by a mechanical or chemi-mechanical process or of which = 10% by weight of the total fibre content consists of such fibres, and weighing 40 g to 150 g/m², n.e.s.