The Observer of London is Sold To Anderson and Atlantic Richfield
Atlantic Richfield Co reaches agreement in London to acquire The Observer, influential 185-yr-old Brit wkly newspaper; agreement is scheduled to be announced formally in London on Nov 24; Atlantic Richfield is headed by Robert O Anderson; Rupert Murdoch, 1 of competing bidders, comments; purchase of paper by foreign co would have to be approved by Brit Govt; Anderson says co's intent in purchasing paper is solely to provide support; Anderson por (M)