Title: Potato collecting expeditions in Mexico and South America
Subjects: Potatoes, Empire Potato Collecting Expedition to South America (1938-1939), Balls' Mexican Expedition, 1938, Empire Potato Collecting Expedition to South America (1938-1939) (uri) http://id.loc.gov/authorities/names/no2004090846 (uri) http://viaf.org/viaf/sourceID/LC|no2004090846