REMOVE

1. Printed
2. River surveys
3. Macao (China)
4. Pearl River (China)
5. Pearl River Delta (China) …

WHAT

1. Thematic Maps (1)

WHERE

1. Macao (China) (1)
2. Pearl River (China) (1)
3. Pearl River Delta (China) (1)

WHO

1. Horsburgh, James (1)

WHEN

1. 1831 (1)