, ▁Pat ric ia ▁S . ▁W arr ick , ▁and ▁Martin ▁H . ▁Green berg ; ▁Hol t , ▁R ine hart ▁and ▁W inst on , ▁January ▁ 1 9 8 4 ; ▁and ▁The ▁Mon ster ▁Book ▁of ▁Mon sters , ▁ed . ▁Michael ▁O ' Sh augh ness y ; ▁C res cent ▁Books , ▁June ▁ 1 9 8 8 . ▁" Syn th etic ", ▁Marvel ▁T ales , ▁July / August ▁ 1 9 3 4 . ▁" The ▁Bar rier ", ▁Ama zing ▁St ories , ▁September ▁ 1 9 3 4 . ▁" C os mic ▁Rh ythm ", ▁Ast ounding ▁St ories , ▁October ▁ 1 9 3 4 . ▁" E ner gy ", ▁Ast ounding ▁St ories , ▁January ▁ 1 9 3 5 . ▁" Val ley ▁of ▁the ▁R uk h ", ▁Ama zing ▁St ories , ▁February ▁ 1 9 3 5 . ▁" The ▁Pl ane ▁Com pass ", ▁Ast ounding ▁St ories , ▁June ▁ 1 9 3 5 . ▁" Par as ite ", ▁Ama zing ▁St ories , ▁July ▁ 1 9 3 5 . ▁" The ▁Challenge ▁from ▁Bey ond " ▁( with ▁Stanley ▁G . ▁Wein baum , ▁Donald ▁W and rei , ▁E . ▁E . ▁Smith , ▁and ▁Murray ▁Le in ster ), ▁Fant asy ▁Magazine , ▁September ▁ 1 9 3 5 . ▁" Pr ince ▁Der u ▁Returns ", ▁Ama zing ▁St ories , ▁December ▁ 1 9