@DividendYield, outside of the physical location, are there any other differences between BHP Billiton plc (BBL) and BHP Billiton Limited (BHP)? It seems to be the same company, except BBL lists the following as their contact information:
Neathouse Place
Victoria
London, SW1V 1BH
United Kingdom - Map
Phone: 44 20 7802 4000
Fax: 44 20 7802 4111
Website: http://www.bhpbilliton.com
Source:
http://finance.yahoo.com/q/pr?s=BBL+Profile

BHP lists the following as their contact information:
BHP Billiton Limited
BHP Billiton Centre
180 Lonsdale Street
Melbourne, VIC 3000
Australia - Map
Phone: 61 3 9609 3333
Fax: 61 3 9609 3015
Website: http://www.bhpbilliton.com

BBL trades at a higher P/E multiple than BHP, but has a slightly higher yield.

http://finance.yahoo.com/q?s=BBL&ql=1
http://finance.yahoo.com/q?s=bhp&ql=1

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