The academic search tool,
Omni, can be used to find both print and electronic books.
The Queen's University Library, and by extension OMNI, uses the Library of Congress Classification System, which classifies materials about Indigenous Peoples under the subject heading "Indians of North America" (see the terminology page for more info on this).
Examples of subject headings and terminology relating to Indigenous Studies:
Native Peoples
Aboriginal Peoples
Indigenous Peoples
Indians of North America
Indian authors Canada Interviews
Haida Indians