From a series of 2,434 pocket-size reference books. The green-edged livery denoted plants and trees.
Other areas covered included science (blue), aviation (slightly different blue), animals (very similar green to plants and trees), cooking (bright yellow), the sea, space, horse racing, archery, medicine, shipping, cartography and textiles (all blue).
The Record Books : if best-selling albums had been books instead…
Christophe Gowans 
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