[NB — this page shows adverts. ELAS do not make money from them, so do not click them — ]
Next we’ll train the search engine to restrict the search to the Transactions (stored as PDF), but for now you should be able to retrieve the volume with the article on the “ice houses” or “free gardeners” and most others, which the native WordPress search would not find.
For now to search only the filetype PDF use:
filetype:pdf "ice houses"
A direct link to the CSE is here.