Northmen in Maine; A Critical Examination of Views Expressed in Connection with the Subject De Costa, Benjamin Franklin Heftet / 2009 / Engelsk
Narrative of Events at Lake George, from the Early Colonial Times to the Close of the Revolution. De Costa, Benjamin Franklin Heftet / 2011 / Engelsk
Northmen in Maine; A Critical Examination of Views Expressed in Connection with the Subject De Costa, Benjamin Franklin Innbundet / 2009 / Engelsk
Pre-Columbian Discovery of America by the Northmen : With Translations from the Icelandic Sagas De Costa, Benjamin Franklin Heftet / 2013 / Engelsk
Verrazano the Explorer Being a Vindication of His Letter and Voyage, with an Examination of the Map of Hieronimo Da Verrazano. and a Dissertation Upon the Globe of Vlpius. to Which Is Prefixed a Bibliography of the Subject. De Costa, Benjamin Franklin Heftet / 2011 / Engelsk
