WHO HAS SOLD THE MOST ALBUMS:  LED ZEPPELIN OR AC/DC

Hello.

Led Zeppelin has sold more albums than AC/DC.

This is true both in the United States and worldwide:

From the Recording Industry Association of America:

" Australian rockers AC/DC received a belated holiday gift from
Elektra Records when 14 titles were upgraded increasing their
certified sales from 46.5 million to 63 million according to the
Recording Industry Association of America (RIAA).  Representing actual
units in excess of 70 million, the band is now tied for ninth place on
the RIAA's Top Grossing Artist list and stands as the fifth highest
certified band in U.S. music history behind The Beatles, Led Zeppelin,
Pink Floyd and Elektra label mates The Eagles."
http://www.riaa.com/news/newsletter/press2001/013101.asp

From Sony Music:
" On a cumulative basis AC/DC has sold a career total of over 140
million albums worldwide."
http://www.sonymusicbonton.cz/aktuality.php?rid=1&cid=24

From Warner Brothers:
"Universally recognised as one of the most innovative, powerful, and
influential groups in rock history, Led Zeppelin has sold some 200
million albums worldwide."
http://www.warnervision.com.au/press_updates_article.asp?id=109

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search strategy:
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"million albums worldwide" "ac dc"

I hope this helps.