It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
Compare the contents notes to the works lists in the Grove Music Online at Grove Music Onlineto verify what works might be missing. Note: For many composers the works lists are annotated with corresponding collected works volumes. You can use the works lists to examine overall coverage in collected works editions.