Unitd States in the 20th century /

Eitemau Tebyg

• United States in the twentieth century /
  gan: Hacker, Louis M.
• Freud and the 20th century /
  gan: Nelson, Benjamin
  Cyhoeddwyd: (1958)
• CHRONICLE OF the 20th century /
  Cyhoeddwyd: (1993)
• Encyclopaedia of the 20th century. /
  gan: Drexel, Johned
  Cyhoeddwyd: (1994)
• Chronicle of the 20th century /
  gan: Daniel, Clifton
  Cyhoeddwyd: (1987)