This would make for dull reading, except that the foreign service officers with an "R" (Reserve) rank are usually CIA officers under State Department cover, particularly if they are listed in the political section. This fun fact became so useful that in the mid-1970s these lists were discontinued.
The list is in two sections: alphabetical by country and alphabetical
by individual's name with a reference back to the country. Our copy of
this April, 1964 list is missing pages 49 through 85, which means the
countries after Sweden and the names in front of "Guaderrama." Still, we
plucked out the likely spooks and included some AID public safety advisors
for good measure.
Extract the names from this source