When it comes to referring to a collection of written works or papers, the phrase "collected volume" may be used. However, if you're looking to add some variety to your vocabulary, there are other phrases and words that can convey the same meaning. For example, "compilation," "anthology," and "omnibus" are all commonly used terms for a collection of works. "Selected essays" and "gathered writings" are more specific options for collections of essays or writings. Additionally, depending on the content of the collection, phrases such as "complete works," "critical edition," or "sourcebook" may be appropriate. Ultimately, the term you choose will depend on the context and purpose of the collection.