The Combined Nomenclature (CN), v1:2019
4820 10: Registers, account books, notebooks, order books, receipt books, letter pads, memorandum pads, diaries and similar articles, of paper or paperboard
https://www.dst.dk/en/Statistik/dokumentation/nomenklaturer/kn?id=ec3af576-673e-42d6-892f-12eb18291831