The Encyclopædia Britannica :
the new volumes constituting, in combination with the twenty-nine volumes of the eleventh edition, the twelfth edition of that work, and also supplying a new, distinctive, and independent library of reference dealing with events and developments of the period 1910 to 1921 inclusive. The first third of the new volumes; volume XXX-XXXII.

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Item Link Original Source
Full view   v.21-22 Pay-Ree University of Michigan
Full view   vol.30 Princeton University
Full view   vol.31 Princeton University
Full view   vol.32 Princeton University