The Biodiversity Heritage Library (BHL) is replete with publications which have had a seminal influence on their field. A highly-credentialed member of this category is John H. Day’s A Monograph on the Polychaeta of Southern Africa, published in 1967 in two volumes by the (then) British Museum (Natural History) in London. It is timely to celebrate this book now: on 24 August 2019 the author John Day would have had his 110th birthday. And, as of this month, the author’s own copy of the book has been digitised for the BHL.
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