[Taxacom] Publication dates for Encyclopaedia Britannica

[Carlos Alberto Martínez Muñoz]

Dear Taxacomers,
I am looking for precise publication dates of the Encyclopaedia Britannica,
particularly the "Supplement to the fourth, fifth and sixth editions of the
Encyclopaedia Britannica" (https://digital.nls.uk/193057498). I would like
to date the article "Annulosa" by William Elford Leach (see page 401).
I have found a couple of resources:
1) The website of the Encyclopaedia Britannica (heavily loaded with
advertising). "The six-volume Supplement to the fourth, fifth, and sixth
editions appeared in half-volumes from *1815* to 1824".
https://www.britannica.com/topic/Encyclopaedia-Britannica-English-language-reference-work/Supplement-to-the-fourth-fifth-and-sixth-editions

2) Wikipedia registers a "supplement to the 5th", appearing from *1816* to
1824. See:
https://en.wikipedia.org/wiki/Encyclop%C3%A6dia_Britannica#1768%E2%80%931826


Any clarification would be greatly appreciated.
Kind regards,
Carlos

Carlos A. Martínez Muñoz
Zoological Museum, Biodiversity Unit
FI-20014 University of Turku
Finland
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