REMOVE

1. Korea
2. Thailand
3. Borneo
4. Hainan Island (China)
5. Celebes Sea

WHAT

1. Borneo -- Maps (1)
2. China -- Maps (1)
3. Manuscripts (1)
4. Philippines -- Maps (1)
5. Sea Charts (1)

Less

WHERE

1. Cambodia (1)
2. China (1)
3. China Sea (1)

More 

WHO

1. Blaeu, Joan, 1596-1673, c … (1)

WHEN

1. 1666 (1)