| Title | The mule |
| Source | New York Public Library Digital Gallery |
| URL | http://digitalgallery.nypl.org/nypldigital/dgkeysearchdetail.cfm?trg=1&strucID=709891&imageID=823278&word=mules&s=1¬word=&d=&c=&f=&k=0&lWord=&lField=&sScope=&sLevel=&sLabel=&total=59&num=0&imgs=20&pNum=&pos=5#_seemore |
| Origin | internet |