Columbia subject headings:
Americans--Spain--History--20th century.
Spain--History--Civil War, 1936-1939--Participation, American.
Spain. Ejército Popular de la República. Abraham Lincoln Battalion.
Harvard subject headings:
Americans--Spain--History--20th century.
Spain--History--Civil War, 1936-1939--Participation, American.
Spain. Ejército Popular de la República. Abraham Lincoln Battalion.
Princeton subject headings:
Americans--Spain--History--20th century.
Spain--History--Civil War, 1936-1939--Participation, American.
Spain. Ejército Popular de la República. Abraham Lincoln Battalion