An apparatus for twisting the soil-root ball of a mature tree to measure the shear strength of the underlying soil /
Smith, D. L. O.(David Llewllyn Owen),1952-author.
British Society for Research in Agricultural Engineering.
Scottish Institute of Agricultural Engineering.
"Scottish Institute of Agricultural Engineering."--front cover.
"Not for publication."--on title page.
Report dated April 1985.
Includes bibliographical references (page 5).
Shear strength of soils