Cover of the original census report. This image is part of the public domain because its copyright has expired. Courtesy of Google Books: https://books.google.com/books?id=VRQSAAAAYAAJ&pg=PA5&dq=united+kingdom+census+1851&hl=en&sa=X&ved=0ahUKEwiovZuGu9riAhVEcq0KHe5-AfAQ6AEIKDAA#v=onepage&q&f=false
