Title: East Persia
Description: The author Brig. General Dickson was Inspector-General of Communications in East Persia during the war.  The book includes some coverage of the origins and logistic support of British interventionist forces in the Meshed- Ashkabad region. (Quoting from page 284 The Russian Revolution and Civil War 1917-1921: An Annotated Bibliography by Jonathan Smele)

East Persia: A Backwater of the Great War has been digitised by Google Books and is in the public domain in USA.  It would be expected therefore to be accessible full view by those who live in USA, but not in areas such as Great Britain or Europe
https://books.google.com/books?id=nhUgAAAAMAAJ
Subjects: World War, 1914-1918
Places: Iran