Legal and financial documents, relating to lands in Unst, Yell and Fetlar, 1650-1969.

Title deeds to lands in Fetlar, Unst, Sandsting and Aithsting, Burra, Dunrossness, Tingwall, Whiteness and Weisdale, Scalloway, Gulberwick and Lerwick, 1598-1962; Legal and related papers, 1706-1951; Miscellaneous papers including correspondence, financial records, printed material, diaries, and records relating to Acts of Parliament, valuations, road construction, herring stations, Commissioners of Supply, Lord Lieutenancy, and First and Second World Wars, 1716-1978; Business and trust accounts and executry papers, 1879-1957; Correspondence, 1733-1961; Plans, 1873-1890; Genealogical papers, 1775-1963. Includes six boxes of uncatalogued invoices, receipts and finance related correspondence (transferred from Museum July 2008).

Letters to Williamson's friends and family and notes by him on various subjects.