Numbers enclosed in brackets refer to a volume. There are three volumes so each page number or sequence of page numbers will be preceded by a volume number. For example:
Doe, John [2] 2, 5, 8-10 [3] 12-18
refers to items on John Doe found in Volume II [2] on pages 2, 5, and
8 through 10, and also in Volume III [3] on pages 12 through 18.