The
writers argument in 1922 was that the archaeological remains
found at Nal were certainly inspired by Elam contemporaneously
with the manufacture of Susian pottery (circa 3000 B.C.),
and further that it was inconceivable a diffusion from the west
as far as Nal could have failed to reach the Indus. Moreover,
it was also argued that the intensive search for gold could
not have failed (at the same time) to have brought culture-bearers
to the Punjab.
From
Human History by G.Elliot Smith