Advertising Poster Principle Vegetable Oils Main Sources School Education. Original vintage educational school room poster showing the main sources of principle vegetable oils including groundnut, cotton seed, sunflower seed, soya bean, oil palm and coconut palm. Designed by Illustrated Classroom Education Co LTD London features a world map with coloured markers corresponding to the colour key below. Published by the makers of Summer County, Stork and Echo Margerine. Horizontal. Good condition, creasing, staining, tears, pinholes, Country of issue: UK, designer: Unknown, size (cm): 76x102, year of printing: 1950s.