Columbia subject headings:
Harvard subject headings:
Ibn Gabirol, active 11th century. Yanb u' al-hay ah.
Ontology--Early works to 1800.
Substance (Philosophy)--Early works to 1800.
Princeton subject headings:
Jewish philosophy--Early works to 1800.
Ontology--Early works to 1800.
Philosophy, Medieval--Early works to 1800.
Substance (Philosophy)--Early works to 1800.