The Katsi Cook Papers consist of information about Cook and her midwifery and women's health practice in the Akwesasne Mohawk community on the St. Regis Mohawk Reservation in northern New York State and on the adjacent Akwesasne reserve in Ontario and Quebec, Canada. The Papers also contain information about Cook's activism related to environmental contamination and human health and about indigenous rights and environmental justice. Included are materials about the Mother's Milk Project initiated by Cook in 1984 to document and monitor levels of PCBs and other industrial pollutants in the breast milk of Akwesasne women living near the St. Lawrence River. Documentation of Cook's environmental justice and Native American health activism is extensive, and includes writings, grant applications, surveys, reports, and statistical data, as well as articles, clippings, and publications.