The Combined Nomenclature (CN), v1:2020
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=82f0fee5-2769-43bc-83fc-79117ee135ae