Physical Review Letters – Volume 66
January - June 1991

• Issue 25 –24 June 1991, pp. 3229-3321
• Issue 24 –17 June 1991, pp. 3089-3227
• Issue 23 –10 June 1991, pp. 2939-3087
• Issue 22 –3 June 1991, pp. 2839-2935
• Issue 21 –27 May 1991, pp. 2689-2837
• Issue 20 –20 May 1991, pp. 2545-2687
• Issue 19 –13 May 1991, pp. 2417-2544
• Issue 18 –6 May 1991, pp. 2281-2416
• Issue 17 –29 April 1991, pp. 2179-2280
• Issue 16 –22 April 1991, pp. 2051-2178
• Issue 15 –15 April 1991, pp. 1947-2049
• Issue 14 –8 April 1991, pp. 1803-1946
• Issue 13 –1 April 1991, pp. 1651-1801
• Issue 12 –25 March 1991, pp. 1547-1649
• Issue 11 –18 March 1991, pp. 1381-1546
• Issue 10 –11 March 1991, pp. 1249-1379
• Issue 9 –4 March 1991, pp. 1107-1247
• Issue 8 –25 February 1991, pp. 969-1102
• Issue 7 –18 February 1991, pp. 847-968
• Issue 6 –11 February 1991, pp. 679-845
• Issue 5 –4 February 1991, pp. 523-677
• Issue 4 –28 January 1991, pp. 397-522
• Issue 3 –21 January 1991, pp. 245-395
• Issue 2 –14 January 1991, pp. 123-243
• Issue 1 –7 January 1991, pp. 1-120