A collected volume is a book that provides a collection of chapters or essays by different authors about a particular topic. Each chapter has a different author or multiple different authors, and the book also usually has one or more editors.
You can search for collected volumes using the Milner Library catalog, very similarly to how you would search for a monograph book. In addition to entering the topic you are looking for in one search box on the advanced search page, enter editor in another search box to help narrow your results to books with editors, which are much more likely to be collected volumes.
To find out if a book is a collected volume: