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Sigler, P. A.; Geib, M. N.; Boone, T. H.
view article (1.0)Measurement of the Slipperiness of Walkway Surfaces.National Bureau of Standards, Gaithersburg, MDJournal of Research of the National Bureau of Standards, Vol. 40, 339-346, May 1938Research Paper 1879; RP 1879,