Non-genre?
Wikipedia (above) and a brief review of the 1st ed. do not make clear that this is speculative fiction.
This is an adventure story set on an outer island of Scotland, featuring two children on a summer scientific expedition with their naturalist father. The witch's daughter of the title is an orphan and "a wildling shunned by the local children".
--review in "The Dreaming Child" by William Buchan, The Spectator 1966-11-11 p628
- 1st ed.
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Price from review in "The Dreaming Child" by William Buchan, The Spectator 1966-11-11 p628.
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WorldCat (OCLC, below) reports ISBN 0575001771, perhaps a later printing.
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Publication date and image are from the product page for this ISBN at Amazon UK 2019-09-17 as "Gollancz; First American Edition edition (1 Sept. 1966)".
UK publisher Gollancz is named at the bottom of the spine.
For this ISBN Amazon US displays a matching front jacket, spine not legible, as "Victor Gollancz; Fourth impression edition (1973)".
The Wikipedia novel article displays a matching front jacket as that of the first edition, Gollancz 1966, reported by dealer at ABEbooks (2011, not found 2019).
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We suppose the cover artist is interior illustrator Hughes. Compare the 1975 Puffin cover art, verified as by Hughes.