A Google search for "Blackfeet Indians" yielded nada.
However there is a page of links for "Blackfoot Indians"

Years ago I found pens made by the Blackfoot Indians" that were super...tons of ink and no gloppy tips. Pen said Blackfoot Indians right on barrell . Didn't we do this once before...looooong ago? No offense to newcomers...sometimes I cannot recall my name, other times ...well it's just luck! I guess!

P.S. Ah Hah! Thread begun by Of Troy re pens :
http://wordsmith.org/board/showthreaded.pl?Cat=&Board=wordplay&Number=39727
Reading old entry there seems there is confusion over Blackfoot/Blackfeet. And the Bureau of indian Affair page is unavailable. If you *really want to know try google of "U.S. Department of the Interior Bureau of Indian Affairs."
Good luck!