The references are Public Record Office piece numbers within class RG11, folio numbers within the piece, and page numbers within an enumeration book.
12 1881 census index 4 Southwood Lane, Hornsey ref RG11 1379 folio 51 page 26 ( household )
43 1881 census index 72 Uttoxeter New Road, Derby St Werbrugh ref 3399 87 10 household
44 1881 census index The Croft, Mickleover ref 2755 48 2 household
320 1881 census 22 Rose Hill Strret, Derby ref 3402 15 24 household
194 1881 census 14 Devonshire Place, Marylebone ref 0153 101 1 (household)
333 1881 census Marylebone ref 0152 91 5 (household)
11 1881 census index 31 Kensington (Place?) , Kensington, London ref 0025 44 38 (household)
15 1881 census Hammersmith ref 0058 10 18 (household)
17 1881 census 36 St James St, St Marylebone, Middlesex. RG11/0151 f98 p28 (household)
113 1881 census HMS Antelope RG11/5635 f114 p5 ("household" is a Navy ship)
36 1881 census 35 Queen St, Neath, Glamorgan, Wales. RG11/5340 74 8 (household)
41 1881 census 43 Rockville St, Tranmere, Cheshire, England. RG11/3586 f131 p42 (household)
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Amended by David Hawgood on 21 April 2004 and validated by W3C Validator