The collection contains photographs taken by Mary T. Sullivan Roy (1899–2005), a schoolteacher. At the time, the Sullivan family lived in Sheenboro, in the Outaouais region. Mary, her colleague Cécilia Downey, and sometimes the priest would leave from the village of Rapides-des-Joachims and travel by horse‑drawn wagon all the way to Lake Dumoine (Big Lake). An Anicinabe guide would meet them there in a canoe equipped with a rudimentary outboard motor, and they would then go sleep at the mouth of the Moose River, where a few Anicinabe families had their encampment. That place is called Mos Sakik.
The next day, the group would continue by travelling up the Moose River to Grand Lake Victoria (Grand Lake).
Overall, her trips took place between 1920 and 1924. She appears to have worked at the point of Grand Lake, at Lake Simon, and possibly also at Jackson Landing.
