What to read after Overland to India, Volume 1?

A detailed account of the journey from Trebizond to Quetta. The route took Hedin through Erzerum, skirted Mount Ararat to Etchmiadzin and Nakichevan (the grave of Noah), and thence by Tabriz and Kasvin to Teheran, where the first part of his journey ended. The second part took him to Nasratabad in Seistan; the third to Quetta, where he may be said to have reached India . . . . The two volumes in which it is recorded contain a vast deal more than is above indicated. There are many digressions (from the bare record of travel) , some of which will not appeal to the general reader, whose interest is chiefly confined to the tale of travel, but many of them will command the attention of geographers and experts . . . . To mention a few, there are notes about Marco Polo's travels, about the Euphrates, Mesopotamia and Nineveh, chapters on travels in the Kavír, on the march of Alexander the Great, on post-glacial climatic changes in Persia, on the distribution of desert and on the plague. This is volume one out of two.