Canada, 1955-1985:

H.350: Miscellaneous correspondence with Canadian scientists, 1955-1963.

H.351-H.353: Correspondence and papers regarding Symposium on Antibiotics, Ste Marguerite, Quebec, 1-3 March 1971.

H.353: Miscellaneous correspondence with Canadian scientists, 1972-1985.

China, 1982-1987:

H.354: Correspondence regarding review article by Abraham for the Chinese Journal of Antibiotics, with draft of article, 1982-1984.

H.355: Correspondence regarding visit to Abraham's department by a Chinese scientist, 1986-1987.

Czechoslovakia, 1960-1986:

H.356-H.358: Correspondence and papers regarding Antibiotics Congress held in Prague, June 1964.

H.359-H.360: Miscellaneous correspondence with Czechoslovak scientists, 1961-1974, 1986.

Denmark, 1971-1991:

H.361-H.362: Correspondence and papers regarding Euchem Conference on Antibiotics Biosynthesis and Function held in Aarhus 28 August-2 September 1972.

H.363: Miscellaneous correspondence with Danish scientists, 1982-1991.

Germany, 1970-1994:

H.364-H.365: Miscellaneous correspondence with German scientists.