hollowed-out books
...that hollowed-out books have been used in bombings, for smuggling, and for covertly photographing people?
...that <b id="mwCFE"><a class="mw-redirect" href="./Concealing_something_in_a_book" id="mwCFI" rel="mw:WikiLink" title="Concealing something in a book">hollowed-out books</a></b> have been used in <a href="./Bomb" id="mwCFM" rel="mw:WikiLink" title="Bomb">bombings</a>, for <a href="./Smuggling" id="mwCFQ" rel="mw:WikiLink" title="Smuggling">smuggling</a>, and for covertly photographing people?