To what extent can year dates be found in Webster's Third? Year dates are scattered throughout Webster's Third, in definitions and in etymologies, ranging from many thousands of years BC to the very recent. Here's a slimmed-down version of the entry for BULL MOOSE.
"Webster's Third and the 20th Century,"
Word Ways: Vol. 36
, Article 4.
Available at: http://digitalcommons.butler.edu/wordways/vol36/iss2/4