In the 1901 census, most first nations people are listed as being "Cree f.b" or "Algonquin f.b." What does f.b. stand for?

The f.b. would stand for Full Blooded or Full Breed (from Joe Wilson & David Agar). According to the Library & Archives of Canada , F.B. referred to a person with a French parent and a Native parent (French Breed). Other forms used include E.B. (English Breed), S.B. (Scottish Breed), I.B. (Irish Breed), O.B. (Other Breed). "Cree F.B" would mean a person born from a Cree parent and a French parent.