Powell, P. 1936- The chemistry of the non-metals / by P. Powell and P. L. Timms - London : Chapman & Hall, 1974 - xii, 281 p. : ill. ; 21 cm. Bibliography : p. 272-273 ISBN: 0412122006 LCCN: 73-013383 Subjects--Topical Terms: NonmetalsChemistry, Inorganic