Columbia subject headings:
Katwijk aan Zee (Netherlands)--Biography.
Merchant marine--Netherlands--Biography.
Schaap, Maarten, 1782-1870.
Ship captains--Netherlands--Biography.
Harvard subject headings:
Katwijk aan Zee (Netherlands)--Biography.
Merchant marine--Netherlands--Biography.
Schaap, Maarten, 1782-1870.
Ship captains--Netherlands--Biography.
Princeton subject headings:
Merchant mariners--Netherlands--Diaries.
Schaap, Maarten, 1782-1870.