The Lettermore on the LDS website refers to the REGISTRATION district. Lettermore is a sub-registration district within the MAIN registration district of OUGHTERARD. The other sub-districts in Oughterard are Cloonbur 1+ 2, and Oughterard. You were required to register a Birth,marriage or death in your local sub-district,which ,in a spreadout rural community ,without much in the way of transport in 1865,could mean a long walk.Your family could be from one of a number of townlands,or from the island or from Lettermore town itself.You won't know that till you get hold of the certifcate. If you want the actual TOWNLAND address for the Martin family,you need to either send to Dublin for the birth certificate, giving the details from the LDS website, or you can get the LDS film numbered on the birth record, from your local LDS centre. Cathy