Google Books is extremely useful, because it searches the complete text of a book. It can help you find books that may not come up in the library catalog. When you find a book that looks good, then do a "Title starts with" search in SEARCH to see if the Library has it.
As of 2019, Google Books contained over 40 million scanned books. Many from before 1925 are available full-text.
Time and Eternity in Mid-Thirteenth-Century Thought by 
The papal monarchy: the Western church from 1050 to 1250 by 
The thought of Thomas Aquinas by 
Three studies in medieval religious and social thought by 
Library Administration: 631.632.7100
