Stock Photo - Gertrud Johanna Woker (16 December 1878 – 13 September 1968) was a Swiss suffragette, biochemist and toxicologist, and peace activist. She wrote for over twenty years itemizing the dangers of chemical substances on the human body. She campaigned against the use of poison gas in warfare.

Stock Photo: Gertrud Johanna Woker (16 December 1878 – 13 September 1968) was a Swiss suffragette, biochemist and toxicologist, and peace activist.

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