EN 
| Letter | Year |
|---|---|
| Vol 70, No. 5 – Sept./Oct. 1989 – The Importance of Teaching | Sep/Oct 1989 |
| Vol. 70, No. 4 – July/August 1989 – Pets and Human Beings | Jul/Aug 1989 |
| Vol. 70 No. 3 – May/June 1989 – The Scope of Responsibility | May/Jun 1989 |
| Vol. 70 No. 2 – March/April 1989 – The Role of Marketing | Mar/Apr 1989 |
| Vol. 70 No. 1 – Jan./Feb. 1989 – Stress in Perspective | Jan/Feb 1989 |
| Vol. 69, No. 6 – Nov./Dec. 1988 – The Quest for Quality | Nov/Dec 1988 |
| Vol. 69 No. 5 – Sept./Oct. 1988 – The Search For Identity | Sep/Oct 1988 |
| Vol. 69, No. 4 – July/August 1988 – Living With The Chip | Jul/Aug 1988 |
| Vol. 69, No. 3 – May/June 1988 – The Strength of Character | May/Jun 1988 |
| Vol. 69, No. 2 – March/April 1988 – The Creative Approach | Mar/Apr 1988 |