Various pieces of research conducted by Hal Thomas and other authors, entitled; 'A Century of Circuses in Switzerland, 'Vocabulary and Translation, De Piste', 'Cirque Olympique', 'Les Ecuyeres', 'French Circus, Dynasties', 'The Permanent Circuses of the Provinces of France, 'Le Cirque D'Hiver', 'Indes to articles in Le Cirque dans L'Univers', 'Liberty Horses', 'The Travelling Circus', 'U.S.A. Circus Biographies', 'Aminals and Men', ' America Railroad Circuses', 'U.S.A. Motorised Circuses', 'Sweden', 'The Circus Overseas', 'Overseas', 'Who was the First' and various loose pieces of research.