diff --git a/mobile.netbiblio.php b/mobile.netbiblio.php
index e59b86d..e93e973 100644
--- a/mobile.netbiblio.php
+++ b/mobile.netbiblio.php
@@ -263,7 +263,10 @@ class NetBiblio extends WebService
     }
 
     public function GetRandomBooks($number = 100) {
-        $sql = "SELECT TOP $number NoticeId FROM Notices ORDER BY NEWID();";
+        $sql = "SELECT TOP $number NoticeId
+                FROM Notices
+                WHERE Notices.[NoticeNr] NOT LIKE '%%~%%'
+                ORDER BY NEWID();";
         $ids = Connection::execute($sql)->to_array();
         $ids = array_map(function($a) { return $a['NoticeId']; }, $ids);
         $books = AudioBook::findBy('NoticeId', $ids, true);