Manuscript proceedings of the meetings of the Board of Assistant Aldermen. In addition to the regular meetings there are also minutes of numerous special meetings and at least some joint meetings were held. Also included in the proceedings are manuscript copies of letters, reports, and other communications received by the Board. Also included are two volumes of rough minutes and one containing the minutes of a single executive/secret session held in 1860. There is, of course, a gap in the records from 1862-1866 during the suspension of Council activities. There is also an unexplained gap from just after March 17, 1868 until the end of February, 1869.

Volumes 1-20 are available on seven rolls of 35mm microfilm; vol 21-23 of proceedings, rough minutes and secret sessions are only available in original format.