During his writing career, which lasted 30 years, he wrote more than 40 books, mostly travel books, but also bird books, and biographies about Amerigo Vespucci, Hernán Cortés, and Israel Putnam.
Frederick the Great | Frederick | West Bromwich Albion F.C. | Frederick II | Frederick II, Holy Roman Emperor | Brighton & Hove Albion F.C. | Frederick Russell Burnham | Frederick Roberts, 1st Earl Roberts | Frederick Law Olmsted | Frederick I, Holy Roman Emperor | Frederick Forsyth | Frederick Douglass | Frederick, Maryland | Prince Frederick, Duke of York and Albany | Frederick III | Frederick I | Frederick Delius | Albion | Frederick William III of Prussia | John Frederick II, Duke of Saxony | Frederick III, German Emperor | Frederick William IV of Prussia | Frederick Schomberg, 1st Duke of Schomberg | Frederick I, Margrave of Brandenburg-Ansbach | Frederick III, Holy Roman Emperor | Frederick, Prince of Wales | Frederick Funston | Frederick Ashton | John Frederick II | Frederick Wiseman |