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Engraved Portrait of a Young Woman., Sir John Frederick William Herschel (British, 1792 - 1871), about 1842, Cyanotype, 10.2 x 7.8 cm (4 x 3 1/16 in Stock Photo - Alamy
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Prussian Blue: A History of Cyanotype | Julia margaret cameron, John herschel, Julia margaret cameron photography
![John F W Herschel's notebook, 1839. by Herschel, John F W (John Frederick William), Sir at Science and Society Picture Library John F W Herschel's notebook, 1839. by Herschel, John F W (John Frederick William), Sir at Science and Society Picture Library](https://s3-eu-west-1.amazonaws.com/lowres-picturecabinet.com/43/main/12/91376.jpg)
John F W Herschel's notebook, 1839. by Herschel, John F W (John Frederick William), Sir at Science and Society Picture Library
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