Description: A secondary title used to amplify or state certain limitations on the main title. It may repeat information already in the main title.
Example(s):
<titl>Monitoring the Future: A Continuing Study of American Youth, 1995</titl>
<subTitl>A Continuing Study of American Youth, 1995</subTitl>
<titl>Census of Population, 1950 [United States]: Public Use Microdata Sample</titl>
<subTitl>Public Use Microdata Sample</subTitl>