| Year: | 1971 |
| Author: | Brinsley LE POER TRENCH |
| Title: | MYSTERIOUS VISITORS |
| Language: | English |
| Originally published as: | THE ETERNAL SUBJECT |
 | ||
| Year: | 1971 | |
| Publisher: | Stein & Day, New York | |
| Description: | 192 p. | |
 |
 | ||
| Year: | 1973 | |
| Publisher: | Stein & Day, New York | |
| Description: | 192 | |
|
The UFO Story
 | ||
| Year: | 1975 | |
| ISBN: | 0-330-24252-0 | |
| Publisher: | Pan Books, London | |
| Description: | 175 | |
  |
 | ||
| Year: | 1977 | |
| Publisher: | Pan | |
| Description: | 175 p. | |
|
| Cover | Language | Title | Year | |
|---|---|---|---|---|
 | English | THE ETERNAL SUBJECT | (Original title) | 1973 |
 | Spanish/Catalan | LA ETERNA CUESTIÓN: LOS OVNIS (Translated by Roser Berdaguer) |
1977 |
| Brinsley Le Poer Trench, 1911 - 1995 (William Francis Brinsley Le Poer Trench) |
| Cover | Title | Year |
|---|---|---|
| THE FLYING SAUCER REVIEW'S WORLD ROUNDUP OF UFO SIGHTINGS AND EVENTS |
1958 | |
 |
THE SKY PEOPLE |
1960 |
| MEN AMONG MANKIND |
1962 | |
 |
FORGOTTEN HERITAGE |
1964 |
 |
THE FLYING SAUCER STORY |
1966 |
| OPERATION EARTH |
1969 | |
|
THE ETERNAL SUBJECT |
1973 |
| SECRET OF THE AGES - UFO's from Inside the Earth |
1974 |