The Manx Society (or to give its full title: The Manx Society for the Publication of National Documents) managed between 1858 and 1893 to produce 33 volumes of Manx-related material on a wide variety and range of topics.
Those titles are best summarised here:
Many have been digitised by a range of libraries though not one seems to either have a full set or to have digitised all titles if they do possess a full run. The Internet Archive is not the easiest to use to locate what has been digitised as it appears to have little or no concern for bibliographical accuracy.
I have located a good number of the titles and will post from time to time with links.