Los Angeles Motordrome
... that the wooden racing surface of the Los Angeles Motordrome was treated with crushed sea shells to improve traction?
... that the wooden racing surface of the <b id="mwE4M"><a href="./Los_Angeles_Motordrome" id="mwE4Q" rel="mw:WikiLink" title="Los Angeles Motordrome">Los Angeles Motordrome</a></b> <i id="mwE4U">(pictured)</i> was treated with crushed <a class="mw-redirect" href="./Sea_shells" id="mwE4Y" rel="mw:WikiLink" title="Sea shells">sea shells</a> to improve traction?