A record book or pad and a method of manufacturing such a book or pad has a stack of sheets in sets A. Each set A consists of a primary sheet P disposed between secondary sheets OS and US. Both faces of the sheet P are provided with a reactive coating 4 of duplicating material and each face of the secondary sheets OS and US which opposes the primary sheet P in the set is provided with reactive coatings 5 of duplicating material. When a marking is applied to the sheet OS for recording a message, pressure from that marking transfers through the sheet OS causing the coatings 4 and 5 between the sheets OS and P to inter-react and form a duplicate marking on a one face of the sheet P. Similarly when a marking is applied to the secondary sheet US, pressure from that marking transfers through the sheet US causing the coatings 4 and 5 between sheet P and US to inter-react and form a duplicate of the marking on the second face of the sheet P. The sheets OS and US may be removed from the book by tearing along perforations 10 and such removed portions may carry low tack adhesive 21. Low tack adhesive 22 may be provided on the secondary sheets OS and US to contact the primary sheet P in the respective sets along the spine part 2 of the book.
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