91色情片

In Michael Crawford鈥檚 excellent The Origins of Native Americans, evidence
from anthropological genetics provides a densely packed survey of demographic,
genetic and morphological variation among Amerindians. The population crash
after European contact altered the genetics of surviving groups, complicating
attempts to reconstruct the pre-Columbian picture. Crawford鈥檚 view is that the
New World was first settled from Siberia between 30 000 and 40 000 years ago.
Published by Cambridge University Press, 拢40/$64.95, ISBN
0521592801.