1939N. S. BondMercurian Menace in Dynamic Science Stories Feb. 62/1
‘The dark side?’ Carson stared at the investigator in amazement; then slowly shook his head. ‘No ma’am! Not Mr. Carson, lady. He stays away from the dark side of Mercury! [...] My dear young lady,’ said Buzz seriously, ‘there are some things that even a space scout doesn’t go out of his way to meet. I mean those things which don’t concern him. Those things that got Henderson and Frizell. The things that destroyed Galactic’s dark[-]side station in two weeks without even leaving a trace behind. The things that flicker through the twilight zone when you’re walking near the border.’
1942N. S. BondBallad of Venus Nell in Planet Stories Spring 60
None but the most daring do any space-faring In those lethal, whirlagig niches, But spacemen all claim that the Bog is aflame With infinite, fabulous riches.