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References in classic literature ?
The Golden Gate National was the keystone of Dolliver's strength, and to the president of that institution Daylight said:--
To him, Judge Scott was the keystone in the arch of injustice, and upon Judge Scott he emptied the vials of his wrath and hurled the threats of his revenge yet to come.
Industry,' said Mr Chester, 'is the soul of business, and the keystone of prosperity.