of f i Td oh a y . f og Jf # so pC 4.é . t e q f r. ? . ¢ ~ Spo 3 2 < “San ) ® Operating ° Arranged Be >/ \ > “ (5 f 13 4 OA Y ’ We % Nite: LPL » 15 . oe See 3 aa f a ‘ J) . a if EH % 09 9 i ~ ) y YK SX Le ‘ . en ? - OT - | : ° a,e : i | Fig. 4. Pot Sampling Stations 0 LY po nt, - Z i 1. New York, N.Y. 2.2 Honolulu, Hawaii 4. 5. 6. Kikuyu, Kenya West Los Angeles, Cal. Salt Lake City, Utah 3. ) 7. Durban, South Africa 13. Karachi, Pakistan 9. 15. 8. Causway, Southern Rhodesia 10. 11. 12. Coral Gables, Fla. Vermillion, S. D. Birmingham, Ala Hiroshima, Japan Nagasaki, Japan of "t. 1h. 16. 17. 18. Bangkok, Thailand Rio de Janeiro, Brazil Bogota, Colombia Lima, Peru Chicago, Til. ¢ / af 4% f ‘6 ah, : 4 St pe f or . . 7 4 .