Sources of information
There are lots of online sites which will enable you to explore and research. The Welsh Woollen Industry page on Wikipedia is excellent - and regularly updated by the team supporting it.
Chis Evans book 'Slave Wales - the Welsh and Atlantic Slavery 1660 - 1850' is excellent and covers many of the ways that link Wales with the iniquitous Slave Trade.
Dr Frances Richardson provided a great link - google Welsh Journals’ and search for Welsh Plains and about 6th down is:
1938: Merioneth woollen industry from 1750 to 1820
or try this: https://datasyllwr.llgc.org.uk/journals/pdf/AWJCR039018.pdf
Helpful link provided by Michael Freeman to his website:
https://welshhat.wordpress.com/
Thanks also to Michael Freeman for pointing us in the right direction: we have now identified from Davies, Walter, General View of the Agriculture and Domestic Economy of North Wales, (London, 1810) (copy below) areas which were the focus of Welsh Plains production:
documents/davies-walter-wool-production-published.docx
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Comments from Early tourists in Wales by Michael Freeman
https://sublimewales.wordpress.com/​
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"The Archives Hub fulfils a vital and unique function in revealing the incredible wealth of archives held within... institutions, and in providing an interface between these resources and researchers and learners in the HE sector and the wider community." (Hub contributor)
https://archiveshub.jisc.ac.uk/introduction/
A Parcel of Ribbons - Anne M Powers
"I hope that by sharing here some of what I have accumulated it may prove of use or interest to others researching their Jamaican connected families, or who simply have an interest in the history of the eighteenth century.
The ‘long eighteenth century’ from the exiling of James II in 1688 to the Battle of Waterloo in 1815, or even the great Reform Act of 1832, is an amazing and formative period in the creation of the modern world. It is also a critical period in the history of Jamaica, from its colonisation by the British beginning in 1655, through the development of ‘King Sugar’ made possible by the enslavement of tens of thousands of Africans, to eventual emancipation in 1838 – all driven by the white Plantocracy for whom Jamaica would provide the route to a fortune or an early grave."
The Fleece is an epic poem by John Dyer.
https://archive.org/details/fleeceapoeminfo01dyergoog/page/n3
An easy to read version of the Chapter of Aiken's book attatched here
Its easy to get lost into research - so keep focussed! On th eother hand following lines that interest you is fine!