File:Bowker, William Henry – Levi Stockbridge and the Stockbridge principle of plant feeding, 1911 – BEIC 7794577.jpg
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![File:Bowker, William Henry – Levi Stockbridge and the Stockbridge principle of plant feeding, 1911 – BEIC 7794577.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/7/70/Bowker%2C_William_Henry_%E2%80%93_Levi_Stockbridge_and_the_Stockbridge_principle_of_plant_feeding%2C_1911_%E2%80%93_BEIC_7794577.jpg/347px-Bowker%2C_William_Henry_%E2%80%93_Levi_Stockbridge_and_the_Stockbridge_principle_of_plant_feeding%2C_1911_%E2%80%93_BEIC_7794577.jpg?20210217083518)
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