#1 James (James H) Hughes, Citizen cyborg.
#3 James Hughes 1959-, Stalin, Siberia and the Crisis of the New Economic Policy.
#4 James Hughes 1955-, EU Conflict Management.
Note that James Hughes(3) and James Hughes(4) write on similar topics (the former Soviet Union and the eastward expansion of the EU). However according to the Library of Congress they are definitely two different people.