Administrative history: During this period, 1911-1926, the individual serving as Secretary-General was Simon van der Aa (Groningen).
Series consists of the correspondence of the Secretary-General, arranged in the following sequence (and therein chronologically): lettres rescues, lettres expediees, with several miscellaneous files following.
File is undated [ca. 1926]. The log entries start "+/- May 11, 1872."