Deaccessioned 06/11/2014. Not in Mission. Obsolete: Controlling Muskrat Damage is Ponds is a 2 page Leaflet to help pond owners who pond is being invaded and damaged by muskrats. The leaflet describes the muskrat den, precautions to take to prevent the dens from damaging the pond, type of banks favorable to avoid damage, and muskrat trapping.