we lost our original parental property papers belongs to L& do

please guide .we lost our parental property papers witch belongs to L& do its a parental property in 1965 l& do alloted that property to our grand father and he is no more and we dont have any clue how to trace property papers since 1965 we are paying house tax electric bill water bill ...now we want to sale that property if we want to sale and in l& do records some one else name alloted by them then how we sale this property....please Guide.