You can locate items in the library by searching Omni by doing a keyword or subject search and then adding one of the special subject terms to your search:
Also try searching for keywords, such as memoirs or documents. For example:
history AND ireland AND sources [keyword boolean search]
ireland AND women AND memoirs keyword boolean search]
Ireland History 1837-1901 Sources [subject heading search]
Famines Ireland History 19th century Sources [subject heading search]
Londonderry (Northern Ireland) History Sources [subject heading search]