As you may remember, a search in Summon includes the library’s catalogue and is particularly useful for finding historic government documents in print (there is also some indexing of online government content).
A key to finding the information is to use multiple keywords and to use Boolean operators OR and Truncation.
In Summon, we can use a filter to limit to just government documents under Content Type. Under the Content Type heading, click the checkbox for Government Document to apply the filter.