The Face of X (1960), by Lionel Roberts.

Virus X (1945), by Sydney Horler.

Commando X (1967), by Poke Runyon.

The Man from Planet X No. 2: Tiger by the Tail (1975), by Hunter Adams.

Why are lowbrow utopias haunted by quatsch?

A delightful legacy technology of the bibliosphere.

Star maps for invisible skies.

The Power of X (1970 edition), by Arthur Sellings.

Illustrating the hilo history of reading and the toilet.

Survival and storms, milliseconds at a time.

Planetary Agent X (1965), by Mack Reynolds.

Border crossings and cyborgs. And drawing on Mars.

A scene from MADIGAN (1968).

Madame X (1966), adapted by Michael Avallone from the 1966 movie.

Nurse Lily and Mister X (1961), by Diane Frazer.

Echo X (1960), by Ben Barzman.

Perry Rhodan No. 16: Secret Barrier X (1972), by W.W. Shols.

Sweet girl-graduates in their golden hair…

If only these stones could sing.

Utopia Minus X (1966), by Rex Gordon

Warrant for X (1945), by Philip MacDonald.

If books are architecture, then illustration can be street art, too.

A champion fighter who defied our sentimental unease.

Her hair was long, her foot was light,/And her eyes were wild.