Series consists of copies of reports written by M.Y. Williams. Series is arranged chronologically. 2.4 m of textual records. M.Y. William's publications and reports and, more broadly, general subjects around which he assembled research material. 2.2 m of textual records.
Series consists of incoming and copies of outgoing correspondence.
Series is arranged alphabetically by correspondant or subject. 6 m of published materials. Series consists of reprints gathered by M.Y. Williams, reflecting his broad interest in geology and natural history. Series is arranged alphabetically by author and, on rare occasions, by subject. 2.16 m of textual records.