REMOVE

1. Don River Delta (Russia)

WHAT

1. Chart Atlas (2)
2. Chart Map (2)
3. Nautical charts (2)
4. Navigation (2)

WHERE

1. Russia (2)
2. Azof (Russia) (1)
3. Tanais (Russia) (1)

WHO

1. Bellin, Jacques Nicolas, … (2)
2. J. Arrivet (2)
3. J.N. Bellin (2)
4. Croisey (1)

WHEN

1. 1764 (2)