William Sonnenschein

Sonnenschein gained experience selling second had books when apprenticed to publishers Williams and Norgate, before starting his own company W. Swan Sonnenschein and Allen. This partnership, with J Archibald Allen, began in London in 1878 and was dissolved in 1882.
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https://archiveshub.jisc.ac.uk/search/archives/db4832d4-9afd-315b-856d-28e68bfc3686

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