De mirabilibus urbis Romae
... that the 12th-century guide to Rome's wonders, De mirabilibus urbis Romae, survived in a single copy?
... that the 12th-century guide to <a href="./Rome" id="mwCS4" rel="mw:WikiLink" title="Rome">Rome</a>'s wonders, <i id="mwCS8"><b id="mwCTA"><a href="./De_mirabilibus_urbis_Romae" id="mwCTE" rel="mw:WikiLink" title="De mirabilibus urbis Romae">De mirabilibus urbis Romae</a></b></i>, survived in a single copy?