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- Great Britain✖[remove]1,545
- United States. Treaties, etc84
- Great Britain. Foreign Office81
- France. Treaties, etc78
- Canada35
- Belgium. Treaties, etc34
- Portugal. Treaties, etc33
- Great Britain. Public Record Office31
- Netherlands. Treaties, etc29
- Italy. Treaties, etc28
- South Africa28
- Germany. Treaties, etc23
- Great Britain. Department of Education and Science22
- Great Britain. Board of Education21
- Denmark. Treaties, etc20
- Great Britain. Ministry of Education20
- Great Britain. Royal Commission on Historical Manuscripts20
- Norway. Treaties, etc19
- Great Britain. Foreign Office. Historical Section18
- Great Britain. Treaties, etc., 1936-1952 (George VI)17