Can be used for substantial periods of any cultures from which little reliable data are available.
This term has 29 records attributed within our system.
GR.5a.1931-probdup
GR.57k.1907
GR.57b.1907
GR.55.1901
GR.57h.1907
GR.57f.1907
GR.57j.1907
GR.57m.1907
GR.57i.1907
GR.57o.1907
GR.57d.1907
GR.10b.1927
GR.10d.1927
GR.5b.1931
GR.10a.1927
GR.57c.1907
GR.17.1904
GR.4.1977
GR.57a.1907
GR.57e.1907
GR.57g.1907
GR.57n.1907
GR.57l.1907
GR.5a.1931
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