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The Finding of Haldgren is a science fiction novel by American author Charles W. Diffin.

Chet Ballard answers the pinpoint of light that from the craggy desolation of the moon stabs out man's old call for help.

A signal is discovered on the Moon, leading to adventur, suspense, thrills, and an adventurous ride through space. 

The Finding of Haldgren is part of the Harkness-Bullard sequence, Dark Moon (1931), Brood of the Dark Moon (1931) and The Finding of Haldgren (1932) involving adventures on an errant new planet full of monsters which has been captured as a new moon orbiting Earth. 

The Finding of Haldgren was first published in Astounding Stories, April 1932. 

Charles W. Diffin (1884-1966) was a US engineer, airplane salesman and science fiction writer. He was one of the better writers whom Harry Bates encouraged to write for the new Astounding Stories.