Henry J. Kostkos

Plutonian n. 1	1935 H. J. Kostkos Earth Rehabilitators, Consolidated in Amazing Stories Apr. 61/1 While unmoved by any feeling of pity, the Earthman nevertheless felt impelled to say something that would enable the Plutonian to regain a more normal composure.
Saturnian n. 2	1935 H. J. Kostkos Earth Rehabilitators, Consolidated in Amazing Stories Apr. 63/2 Ross Griffin had been busily taking down Gurra’s confession in Saturnian and when the man finished he handed it to him to sign.