Columbia subject headings:
Harvard subject headings:
Businesspeople--Correspondence.
Germany--Biography.
Linde, Helmut--Correspondence.
Linde, Richard--Correspondence.
Linde, Werner--Correspondence.
Lynn family--Correspondence.
National socialism.
World War, 1939-1945--Personal narratives.
Princeton subject headings:
Gesellschaft für Linde's Eismaschinen--Biography.
Lynn family--Correspondence.
World War, 1939-1945--Personal narratives, German.