Byrd returned to the Antarctic in 1934 for a solo mission. He spent five months alone in a meteorological station, where he suffered carbon monoxide poisoning from an ill-ventilated stove. He was later rescued and recounted the tale in his autobiography Alone. The US Post Office issued #733 to commemorate this expedition, though the stamp wasn’t distributed for public sale. Rather, it was issued for use on letters mailed through the Little America Post Office that was established at the base camp of the Byrd Antarctic Expedition in the territory of the South Pole.