I had been asked to catalogue a bundle of rolled survey plans before they were moved. The paper ties carried shelf codes, but two had slipped onto the floor and there was no way to tell which rolls they belonged to. On one plan, the title was hidden beneath a repair strip that staff were not permitted to lift. A pencilled date looked like 1911 in the register and 1917 on the catalogue card. Because the paper was brittle, I could unroll only the outer section, while the author's name lay further inside. At closing time, I left the uncertain fields blank and attached a note listing the conflicting evidence.