Error in documentation see Search Systematic Theology Cross-Reference Dataset. "also" is a strange choice of words for "only"
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For example, the Systematic Theology Cross References Dataset contains approximately 830,000 references that have been categorized according to denominational affiliation (Anglican, Medieval, Patristic, etc.) and theological category (Christology, Anthropology, Ecclesiology, etc.). This dataset is also accessible through the Systematic Theologies section of the Passage Guide.
Logos Help (Bellingham, WA: Faithlife, 2018).