Americas

1949 - 1975 Vols. 1 - 27 Vol. 28, no. 1 January ; nos. 11 - 12 November - December Vol. 29, no. 3 March ; no. 5 May ; no. 8 August ; no. 9 September Vol. 30, no. 1 January ; no. 2 February ; nos. 11 - 12 November - December Vol. 31, no. 2 February ; nos. 11 - 12 November - December Vol. 32, no. 1 January ; no. 5 May ; no. 6 June ; no. 7 July Vol. 33, no.3 March ; no. 8 August ; no. 10 October Vol. 34, no. 3 March ; no. 4 April ; no. 6 June Vol. 35, no. 1 January ; no. 4 July - August ; no. 6 November - December 1985 - Vol. 37, no. 5 1986 - Vol. 38, no. 2 March - April ; no. 3 May - June ; no. 4 July - August ; no. 5 September - October ; no. 6 November - December 1987 - Vol. 39, no. 1 January - February ; no. 2 March - April ; no. 3 May - June ; no. 4 July - August ; no. 6 November - December 1988 - Vol. 40, no. 2 March - April ; no. 3 May - June 1989 - Vol. 41, no. 1 January 1990 - Vol. 42, no. 1 1991 - Vol. 43, no. 3 March, nos. 5 & 6 May - June 1992 - Vol. 44, no. 1 January 1993 - Vol. 45, no. 2 March - April ; no. 3 May - June ; No. 4 July - August