
Blast Off at Woomera is a children's science fiction novel, the first in the Chris Godfrey of U.N.E.X.A. series by British author Hugh Walters. It was published in the UK by Faber in 1957, in the USA by Criterion Books in 1958, and in the Netherlands in 1960 by Prisma Juniores.

The Blue Aura is a juvenile science fiction novel, the nineteenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber and Faber in 1979.

The Caves of Drach is a juvenile science fiction novel, the seventeenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1977.

The Dark Triangle is a juvenile science fiction novel, the twentieth and last published in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1979. One final book - The Glass Men - was written, but was never published.

Destination Mars is a juvenile science fiction novel, the sixth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1963 and in the US by Criterion Books in 1964. Also published in German by Schneider Buch as Der Chor der Verdammten in 1983, and in Portuguese by Galeria Panorama in 1969 as Destino Marte.

The Domes of Pico is a juvenile science fiction novel, the second in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1958, in the US by Criterion Books in 1959 under the title Menace from the Moon and in the Netherlands by Prisma Juniores as 'De Maan Valt Aan' in 1960.

Expedition Venus is a juvenile science fiction novel, the fifth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1962 and in the US by Criterion Books in 1963.

Journey to Jupiter is a juvenile science fiction novel, the eighth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1965 and in the US by Criterion Books in 1966.

The Last Disaster is a juvenile science fiction novel, the eighteenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1978

Mission to Mercury is a juvenile science fiction novel, the ninth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in 1965 in the UK by Faber and in the US by Criterion Books. Also published under the name Missão Mercúrio in Portugal by Galeria Panorama.

The Mohole Mystery is a juvenile science fiction novel, the eleventh in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1968, in the US by Criterion Books in 1969 under the title The Mohole Menace. It was also published in French as Pionniers des ténèbres, by Éditions de l'Amitié in 1973 and as A ameaça de Mohole in Portuguese by Edições Dêagã.

Moon Base One is a young adult science fiction novel, the fourth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1960, in the US by Criterion Books in 1962 under the title Outpost on the Moon.

Murder on Mars is a juvenile science fiction novel, the sixteenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1975. It was the second in the series to switch to detective work rather than space exploration.

Nearly Neptune is a juvenile science fiction novel by British writer Hugh Walters, the twelfth in his Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1969 and in the US by Washburn Books under the title Neptune One is Missing.

Operation Columbus is a juvenile science fiction novel, the third in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1959, in the US by Criterion Books in 1960 under the title First on the Moon, and in the Netherlands by Prisma Juniores as 'Wedloop naar de Maan' 1963.

Passage to Pluto is a juvenile science fiction novel, the fourteenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series.

Spaceship to Saturn is a juvenile science fiction novel, the tenth in Hugh Walters' "Chris Godfrey of U.N.E.X.A." series. It was published in 1967 in the UK by Faber and in the US by Criterion Books and in Portugal under the title Voo para Saturno by Edições Dêagã in 1975.

Terror by Satellite is a juvenile science fiction novel, the seventh in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in 1964, in the UK by Faber and in the US by Criterion Books. Later published in Portugal by Galeria panorama under the name Pânico no satélite

Tony Hale, Space Detective is a juvenile science fiction novel, the fifteenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1973.