Cumulative Index 1968–1969

Volume XV: 1-96, January–February 1968; 97-192, March–April 1968; 193-288, May–June 1968; 289-368, July–August 1968; 369-464, September–October 1968; 465-560, November–December 1968. Volume XVI: 1-96, January–February 1969; 97-192, March–April 1969; 193-288, May–June 1969; 289-368, July–August 1969; 369-464, September–October 1969; 465-560, November–December 1969.