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Was Mary Stelfox buried in a public grave or a private grave? If she was in a private grave, then Allerton {for a fee} will tell you who else is buried in that grave, which could be useful for finding other family members. However, if she was buried in a public grave, then she is in with strangers who just happened to die at about the same time. There are usually about a dozen per public grave. In that case, Allerton will not tell you who else is buried in that grave.
There are no grave stones/markers for public graves