Controls on the spacing of first-order valleys

Perron JT, Dietrich WE & Kirchner JW
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Perron, J. T., Dietrich, W. E., & Kirchner, J. W. (2008). Controls on the spacing of first-order valleys. Journal of Geophysical Research F: Earth Surface, 113(F4), 1-21. https://doi.org/10.1029/2007JF000977