He was the fourth Librarian of the United States Congress from 1829 to 1861 .
John Silva Meehan ( 6 February 1790 -- 24 April 1863 ) was an American printer and publisher .
John Silva Meehan was the fourth John Silva Meehan of the United States Congress from 1829 to 1861 .
John Silva Meehan ( 6 February 1790 -- 24 April 1863 ) was an American printer and publisher .