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Re: How many Mononykus?

Yes, there is now a North American Alvarezsaurid.  Not necessarily
Mononykus, but at least in the same group.  It is only identified down
to family level (due to incomplete material).  It is from the
Maastrichtian Hell Creek Formation of Montana.

Hutchinson, J.R., and Chiappe, L.M. 1998. The first known Alvarezsaurid
(Theropoda: Aves) from North America. Journal of Vertebrate Paleontology

A complete (up-to-date) listing (with *references*) of all published
dinosaurians from the Hell Creek Formation can be found at the following