Ninth German Inner Africa Research Expedition
... that the Ninth German Inner Africa Research Expedition recorded 2,000 examples of rock art?
... that the <b id="mwAeI"><a href="./Ninth_German_Inner_Africa_Research_Expedition" id="mwAeM" rel="mw:WikiLink" title="Ninth German Inner Africa Research Expedition">Ninth German Inner Africa Research Expedition</a></b> recorded 2,000 examples of <a href="./Rock_art" id="mwAeQ" rel="mw:WikiLink" title="Rock art">rock art</a>?