156 x 198 mm. The caption on the reverse reads 'Maize, sorghum, millet, beans and cotton are grown. Maize is the favourite food in Bechuanaland, but sorghum is the crop best suited to the droughty climate. Shown here is a field of sorghum, with plants covered by envelopes to control pollination'. A more lengthy caption summarises the physical and human geography of the Bechuanaland Protectorate.