%0 Book %A Moodie, D. W. %E Catchpole, A. J. W. %I University of Manitoba, Department of Geography %D 1975 %G English %T Environmental data from historical documents by content analysis : freeze-up and break-up of estuaries on Hudson Bay 1714-181 / by D.W. Moodie and A.J.W. Catchpole.