National Geographic : 1944 Jan
) National Ueograpilc society Workmen Make Little Ones from Big Ones at Itabira! As soon as machinery is installed, the big blocks of iron ore will be crushed mechanically into shipping sizes. ltoaacnromes Dy w. toDert ivoore Critical Eyes ExamineQuartz Crystals for Imperfections Before being shipped from RiodeJaneiro they are inspected under ultraviolet light. Flawless crystal plates are needed for radio and detection devices.