Petra Dark "The Environment of Britain in the First Millennium AD"
London:Duckworth 2000 isbn 0-7156-2909-3 2 covers the period before this
but one comment she makes is the lack of researched pollen sequences for
representative sites for later years. The price of cereals would
indicate good/bad harvest years (figures would appear to be available
from 1500's and its correlation with wet/dry years has been noted since
at least the 1930's in geography textbooks), as might records of herring
fisheries (its migration southwards depends on sea temperature) but
plentiful accounts from diaries + measurements only seem to date from 1600's
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