reserves
... that Belarus contains large, but undeveloped reserves of oil shale?
... that <a href="./Belarus" id="mwCyM" rel="mw:WikiLink" title="Belarus">Belarus</a> contains large, but undeveloped <b id="mwCyQ"><a href="./Oil_shale_in_Belarus" id="mwCyU" rel="mw:WikiLink" title="Oil shale in Belarus">reserves</a></b> of <a href="./Oil_shale" id="mwCyY" rel="mw:WikiLink" title="Oil shale">oil shale</a>?