![](issue/2013-01/cover.jpg) January 2013 (Volume 140, No. 1) | ![](issue/2013-02/cover.jpg) February 2013 (Volume 140, No. 2) | ![](issue/2013-03/cover.jpg) March 2013 (Volume 140, No. 3) | ![](issue/2013-04/cover.jpg) April 2013 (Volume 140, No. 4) |
![](issue/2013-05/cover.jpg) May 2013 (Volume 140, No. 5) | ![](issue/2013-06/cover.jpg) June 2013 (Volume 140, No. 6) | ![](issue/2013-07/cover.jpg) July 2013 (Volume 140, No. 7) | ![](issue/2013-08/cover.jpg) August 2013 (Volume 140, No. 8) |
![](issue/2013-09/cover.jpg) September 2013 (Volume 140, No. 9) | ![](issue/2013-10/cover.jpg) October 2013 (Volume 140, No. 10) | ![](issue/2013-11/cover.jpg) November 2013 (Volume 140, No. 11) | ![](issue/2013-12/cover.jpg) December 2013 (Volume 140, No. 12) |