Soil classification handbook : unified soil classification system /

by Howard, Amster K.
Denver, Colo. : Geotechnical Branch, Division of Research and Laboratory Services, Engineering and Research Center, Bureau of Reclamation, 1986
2nd ed.

Soil classification handbook : unified soil classification system /

by Howard, Amster K.
Denver, Colo. : Geotechnical Branch, Division of Research and Laboratory Services, Engineering and Research Center, Bureau of Reclamation, 1986
2nd ed.

Laboratory classification of soils : unified soil classification system /

by Howard, Amster K.
Denver, Colo. : Geotechnical Branch, Division of Research and Laboratory Services, Engineering and Research Center, Bureau of Reclamation, 1986
2nd ed.

Visual classification of soils : unified soil classification system /

by Howard, Amster K.
Denver, Colo. : Geotechnical Branch, Division of Research and Laboratory Services, Engineering and Research Center, Bureau of Reclamation, 1986
2nd ed.