Like the series for her husband, this bulk of this series consists of personal correspondence, both to and from "Aunt Gussie" as she preferred to be called. The correspondence reflects the social life of one of Grand Rapids' more wealthy families and the happenings within the extended family. Also contained are material on Augusta Hillyer's service in the Garden Clubs of America. The diaries present a brief accounting of the days events, particularly social events. This series also contains the baby book for Hillyer Brewer, the first son of Joseph and Augusta, who died as a small child from burns.