The American Indian Experience (AIE) offers access to an online library, featuring more than 150 volumes of scholarship and reference content, hundreds of primary documents, and thousands of images.

American Indian Histories and Cultures: Sources from the Edward E. Ayer Collection at the Newberry Library, Chicago; a digitized collection providing insight into interactions between American Indians and Europeans from earliest contact up to civil rights movement of the mid-twentieth century

HathiTrust is a partnership of academic & research institutions, offering a collection of millions of titles digitized from libraries around the world. Contains everything from government documents to magazines to organizational reports to books.