Index to wills. Each index arranged alphabetically, then chronologically. 1850-1950, Burr Index; gives year, name of decedent, file number, book and page of will book. 1950-1951, Cott Index, gives year, name of decedent, book and page of will book. 1960-1969, Hall & McChesney Index, gives year, name of decedent, file number, book and page. In addition, there is a handwritten header “case-no.” creating a column in the left margin giving hyphenated case numbers. Each handwritten with a printed header. For years before 1850 see BALTIMORE COUNTY REGISTER OF WILLS (Wills, Index) 1664-1969: microfilm CM189, paper C436.