Statistics for occurrence #1 of “Mass.” in chapter 15 of Horace Greeley, The American Conflict: A History of the Great Rebellion in the United States of America, 1860-65: its Causes, Incidents, and Results: Intended to exhibit especially its moral and political phases with the drift and progress of American opinion respecting human slavery from 1776 to the close of the War for the Union. Volume I.:

...was elected by ballot and composed as follows: Mr. Henry Clay, of Kentucky, Chairman. Messrs. Dickinson, of N. Y., Phelps, of Vt., Bell of Tenn., Cass, of Mich., Webster, of Mass. , Berrien, of Ga., Cooper, of Pa., Downs, of La., King, of Ala., Mangum, of N. C., Mason, of Va., Bright, of Ind. Mr. Clay reported from said Committee a recommendat...
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