Here you go :
1871 census :
RG10/1395, Folio 94, Page 1
Buckinghamshire, Amersham
Rushey Meadow
William Hall Balster, h, mar, 51, Retired Merchant, b. Dorset, Sherborne
Elizabeth, wife, 44, b. West Indies, Jamaica
Mary Ann Howe, serv, unm, 21, General Servant, b. Middlesex, Uxbridge
Kind regards,
Pels.