Statistics for occurrence #1 of “Springfield, Illinois” in chapter 23 of Thomas Wentworth Higginson, Harvard Memorial Biographies:

...arlestown, Massachusetts. He was admitted to the Suffolk Bar in Boston, January 28, 1858, and soon afterwards went to the West to practise his profession. While looking for an opening, he visited Springfield, Illinois , where he made the acqaintance of Abraham Lincoln, and of his law-partner, Mr. Herndon; and after visits to St. Louis and elsewhere, he, at their suggestion, returned to Springfield and commenced pra...
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