II and III (1897-1906).
R.Grousset: _Histoire de l'Asie_, t.

III (3rd edit., 1922), Chap.

I.
A short and charmingly written account of the Mongol Empires from Genghis Khan to Timour.
H.Howarth: _History of the Mongols_ (1876).
3.

For medieval trade with the East the best book is-- W.Heyd: _Histoire du Commerce du Levant au Moyen-Age_, trans., F.Raynaud; 2 vols.

(Leipzig and Paris, 1885-6, reprinted 1923).
_C.