EN 
| Letter | Year |
|---|---|
| Vol. 61, No. 1 – January 1980 – The Mysteries of Motivation | January 1980 |
| Vol. 60, No. 12 – December 1979 – Food and Knowledge | December 1979 |
| Vol. 60, No. 11 – November 1979 – The Great Detectives | November 1979 |
| Vol. 60, No. 10 – October 1979 – Who’s Afraid of Middle Age? | October 1979 |
| Vol. 60, No. 9 – September 1979 – The Unknown Explorers | September 1979 |
| Vol. 60, No. 8 – August 1979 – God Bless Americans | August 1979 |
| Vol. 60, No. 7 – July 1979 – The Forest and the Trees | July 1979 |
| Vol. 60, No. 6 – June 1979 – Rediscovering the City | June 1979 |
| Vol. 60, No. 5 – May 1979 – Understanding Childhood | May 1979 |
| Vol. 60, No. 4 – April 1979 – The Learning Revolution | April 1979 |