West of Eden was part of a Trilogy. I think it ended with Winter In Eden. Pretty interesting, but three books was stretching it.
I saw a spot on TV recently about CM and ND coexisting. IIRC, they posited that there was violence between the two groups because they found CM skulls with holes in them.
I think they also said that CM looked very similar to HS, but you'd be able to pick them out of a lineup.
Hmmm