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
Image Rare Books Chronology of chemistry in Pennsylvania Chronology of chemistry in Pennsylvania / by R.D. Billinger and Wyndham D. Miles, [typescript], 1966-1967. 36 leaves ; 28 cm. View Item
