Description
The lower image shows the preparation of the 'Lixivium' of saltpetre from horse dung or the leaves of trees
about 1920 - 1925 [verso about 1908]
Sir Alec Issigonis
A group of seven men stand to the right of the image
Freddie Marsden
Blaise Pascal Calculating Machine mb-code AAED001652 The lower image shows the
Exchange/Return Notes
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