Columbia subject headings:
Harvard subject headings:
Essen (Germany)--History--20th century.
Germany--Politics and government--1888-1918
Potatoes--Harvesting--Pomerania (Poland and Germany)--History.
Students--Germany--Essen--Biography.
World War, 1914-1918--Germany.
Princeton subject headings:
Germany--History--Revolution, 1918--Sources.
High school boys--Germany--Essen--History--20th century.
High school students' writings, German--Germany--Essen.
Potatoes--Harvesting--Pomerania (Poland and Germany)--History--20th century--Sources.
World War, 1914-1918--Personal narratives, German.