| http://www.w3.org/ns/prov#value | - It is most probable that the winter of 1763??1764 was financially his most difficult up to that time, and that he was unable to give his book the energy and attention he wished, especially for corrections and additions to Volume II. He had scarcely touched the first volume, although he had much more material to incorporate into it??? Adanson, Part One, Pittsburgh, 1963, p. 49.
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