Hi Geoff, I'm not sure what you mean, but the page numbers in each piece which consists of a number of enumerator's books will not be unique in themselves, but are when combined with a folio number, except for the 1841 census where the foliation starts with each enumerators book, so is duplicated in each book. However for the 1851 and later censuses the Piece is foliated as a whole from the first folio in the first enumerator's book to the last folio in the last enumerator's book. The Schedule numbers are not unique, the same as page numbers, usually starting at 1 in each book. Just to mention that the Piece numbers for the 1841 and 1851 are consecutive, starting at 1466 for the 1851 census. Stan