1. Mercurius bifrons, or, The English Janus : the one side true and serious, the other jocular : the Published / Created: in the year 1681. Call Number: Z17 06 Image Count: 2 Resource Type: Books, Journals & Pamphlets Found in: Beinecke Rare Book and Manuscript Library > Mercurius bifrons, or, The English Janus : the one side true and serious, the other jocular : the true and serious intelligence, or, occurrences domestick and forraign.