Thanks much for this! I just replaced "Personal Documents" in the script with "Newspapers" (as below) and removed all of my archived newspapers.
Code:
javascript:(function(){ var v = new RegExp("Newspapers"); if (!v.test(document.URL)) { return false; } {a=document.getElementsByClassName('rowBodyCollapsed');for(var i = 0; i<a.length; i++){Fion.deleteItem('deleteItem_'+a[i].getAttribute('asin'));};return; }})();