Irreplaceable video footage was stolen during a burglary in Retford.
A number of tapes containing material from family events were taken from a shed in Thrumpton Close along with a silver camcorder.
Police are appealing for witnesses to the break-in which happened between 1pm on Thursday 19th July and 5pm on Saturday 21th July 2012.
PC Gary Glover said: “The camcorder was of little value but the footage on the tapes was priceless to the family.”
“They contain lasting memories of precious family occasions which cannot be replaced and the owners want to have them back in their possession.”
Anyone with information about the burglary, or who knows where the tapes are, is asked to call PC Glover on 101, extension 807 7464, or Crimestoppers anonymously on 0800 555 111.