Columbia subject headings:
Sales--Germany--History--1933-1945.
Standardized terms of contract--Germany--History--1933-1945.
Warranty--Germany--History--1933-1945.
Harvard subject headings:
Sales--Germany--History--1933-1945.
Standardized terms of contract--Germany--History--1933-1945.
Warranty--Germany--History--1933-1945.
Princeton subject headings: