Columbia subject headings:
Harvard subject headings:
Wernher, der Gartenaere, active 13th century--Criticism and interpretation.
Wernher, der Gartenaere, active 13th century. Helmbrecht.
Princeton subject headings:
Wernher, der Gartenaere, active 13th century--Criticism and interpretation.
Wernher, der Gartenaere, active 13th century. Helmbrecht.