Columbia subject headings:
World War, 1914-1918--Personal narratives.
Harvard subject headings:
Businesspeople--Germany--Biography.
Businesspeople--Samoa--Biography.
Hanssen, Karl.
Merchants--Germany--Biography.
Merchants--Samoa--Biography.
Prisoners of war--Germany--Biography
Prisoners of war--New Zealand--Biography.
World War, 1914-1918--New Zealand--Biography.
World War, 1914-1918--Personal narratives, German
World War, 1914-1918--Samoa--Biography.
Princeton subject headings:
Hanssen, Karl--Diaries.
World War, 1914-1918--New Zealand--Personal narratives.
World War, 1914-1918--Samoan Islands--Personal narratives.