33288415-The_Metal_Monster
https://pulpcovers.com/wp-content/uploads/2011/10/33288415-The_Metal_Monster-658x947.jpgSome later paperback covers for this story can be seen here. via via
38404013-01_argosy_1920_08_07_glen
https://pulpcovers.com/wp-content/uploads/2011/10/38404013-01_argosy_1920_08_07_glen-658x935.jpgSome later paperback covers for this story can be seen here. via via
Some later paperback covers for this story can be seen here.