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