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3.3. Year number

The First Christmas Bird Count was run on Christmas Day in 1900. Later, the count period was extended to allow counts on dates from mid-December through early January.

Each yearly cycle is published separately. We will use the term year number to mean 1 for the first year of the CBC, 2 for the second, and so on. In general, year number N includes dates in December of year 1899+N and January of year 1900+N.