title: Valid climatological data from historical sources by content analysis.
abstract: Content analysis is used to derive dates of freeze-up and break-up from historical descriptions of river estuaries on Hudson Bay between 1714 and 1871. Validity testing of these dates indicates that they are comparable with modern data. It is thus proposed that the method affords potential for the systematic retrieval of a broad array of environmental data from the historical past.
authors.forename: D W
authors.initials: DW
authors.lastname: Moodie
authors.forename: A J
authors.initials: AJ
authors.lastname: Catchpole