All encyclopedias, whether print or online, are listed in the Franklin Catalog.

One way to retrieve subject encyclopedias is to do keyword expert search in the Franklin Catalog on the subject field word encyclopedias and add a subject-related keyword to the search.  Examples:

subject:encyclopedias AND anthropology

subject: encyclopedias AND religion

Often, in Franklin Articles+, searches will retrieve encyclopedia articles that link to full-text. 

Many research guides for specific subjects list useful encyclopedias in that field.