| 30 April 1868 |
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Convention between Great Britain, Austria, France, Italy, Prussia, in the name of the North German Confederation, and Turkey, for the Guarantee of a Loan to complete the Works at the Sulina Mouth and Branches of the Danube |
| 28 December 1879 |
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Additional Act to the Public Act of November 2, 1865 relative to the Navigation of the Mouths of the Danube signed by the delegates of Great Britain, France, Italy and Turkey |
| 28 May 1881 |
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Additional Act to the Public Act of the European Commission of the Danube of the 2nd November, 1865, relative to the Navigation of the Mouths of the Danube |