Plz help with a report!! I cant find any info on it!!?

I have to do the Cohokians. I dont know anything about them... The internet has nothing... I dont have an encyclopedia!!! My reposrt is due on FRIDAY!! I only have tonight and tomorrow left to do it or else Im going to ger an F!! Plz help me find any information about them or something that you know about them. I CANT GET AN F!!! Thanks so much!!