Image Rare Books A new departure in ore dressing, 1896 A new departure in ore dressing / Wetherill Concentrating Co. South Bethlehem, Pa. : Wetherill Concentrating Co.?, 1896. 7 p. : ill. ; 25 cm. View Item
Image Rare Books Chronology of chemistry in the Lehigh Valley. Chronology of chemistry in the Lehigh Valley / R.D. Billinger, [typescript], 1969. 501 leaves ; 28 cm. View Item