Hosted by the UK Data Archive at the University of Essex, the Online Historical Population Reports comprise a rather impressive set of historical data that should be of interest to historians, demographers, and anyone with an inkling to learn more about various aspects of life in the British Isles from 1801 to 1937. All told, this online archive contains 200,000 pages of census and registration material. First-time visitors may wish to click on over to the "Help" section, as this area provides information about how to create an effective search and the use of various terms within each search. Along with the actual published census report and those on the registrar general, there are around 200 essays offered here authored by Edward Higgs and Matthew Woollard which cover topics like the cholera report of 1850 and the religious worship census of 1851.