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Gilbert, P. A., & Hode Keyser, J. (1973). A Study of Currently Used Methods for Determining the Permeability of Bituminous Mixtures. Journal of Testing and Evaluation, 1(6), 484-493. External link
Lee, K. L., Dean Adams, B., & Vagneron, J.-M. J. (1973). Reinforced Earth Retaining Walls. Journal of the Soil Mechanics and Foundations Division, 99(10), 745-764. External link
Spitz, G., & Darling, R. (1973). Pétrographie des Roches Encaissantes du Gisement Cuprifère de Louvem. Canadian Journal of Earth Sciences, 10(5), 760-776. External link