This was published in 1923 to indicate the diffusion of culture before 1500 B.C.

B and P. – The lines of diffusion form Elam (E) to India.

BR. – The probable home of bronze.

S. – Sumer.

T. – Anau in Turkestan.

H. – The Megalithic Area in Southern India.

Co. – Colchis, the Megalithic Area in the Caucasus.

From Human History by G. Elliot Smith