| nombre | tipo de medio | fecha | Autor | Idioma | tipo | Ubicación narrativa | Título |
|---|---|---|---|---|---|---|---|
| Global Effects of Environmental Pollution | 1970 | Frederick Singer | |||||
| Manned Laboratories in Space | 1970 | Frederick Singer | |||||
| Is There an Optimum Level of Population? | 1971 | Frederick Singer | |||||
| The Changing Global Environment | 1975 | Frederick Singer | |||||
| Arid Zone Development | 1977 | Frederick Singer |