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This issue's cover: Three-dimensional reconstruction of macropores in four intact soil cores (800 mm × 77 mm ID). Computer programs were developed to generate these three-dimensional representations on the basis of x-ray CAT scan data. The macropores are displayed as vertical descending structures. An artificial macropore (1-mm ID polyethylene tubing) was placed in the fourth column to verify the ability of the CAT scanner to portray the size and the location of a known pore. It can be observed in the 3-D representation of the macropores of the fourth column. See Johan Perret et al., Three-dimensional quantification of macropore networks in undisturbed soil cores, p. 1530-1543.