Soviet Russia and Tibet : the debacle of secret diplomacy, 1918-1930s / by Alexandre AndreyevThe myth of the masters revived : the occult lives of Nikolai and Elena Roerich / by Alexandre AndreyevThe quest for forbidden lands : Nikolai Przhevalskii and his followers on Inner Asian tracks / by Alexandre Andreyev, Mikhail Baskhanov, Tatiana Yusupova