- NLW ex 1400.
- File
An index, compiled by R. E. Hart, of the 1851 census returns for the parish of Garthbeibio, co. Montgomery (NLW ex 1400). Additional genealogical material compiled by Hart during his researches on various Montgomeryshire families, comprising material relating to the Whittington family together with details of wills and administrations of persons from the parish of Garthbeibio, co. Montgomery, listed in the St Asaph Probate Act Books, 1821-56. (NLW ex 919).