JF Ptak Science Books Quick Post
Given my non-existent Spanish skills, the closest I can come to interpreting this tiny pamphlet (published in 1943 and received by the Library of Congress three days before D-Day in 1944 and me in 1998) is that it was a word of caution. The warning is obvious–that Yugoslavia was of interest to the Soviet Union–but in 1943 given the state of the war and Yugoslavia being occupied by several Axis forces the concerns of being overtaken by Moscow seem to be way down the to-do list. The Soviets did provide limited assistance, and they did leave Yugoslavia at teh end of the war, and there was a Communist government established there in 1946–but by 1948 there was a break in relations between it and the USSR, and Yugoslavia attempted to remain non-aligned.
The map is simplified and very direct, which makes it pretty effective. Why it was printed in Spanish, I don’t know.