Shelby M. Cullom, “Lincoln and His Relations with Congress,” in Nathan William MacChesney, editor, Abraham Lincoln: The Tribute of a Century, 1808-1909, p. 503..
Three Congresses met during the Lincoln administration: the Thirty-seventh, Thirty-eighth, and Thirty-ninth Congresses. Mr. Lincoln understood the mentality members of Congress from his one term there in 1847-1849. Several of those with whom he had served from Illinois played a continuing role in his life.