Drop-cone tests in the field and on minimally disturbed soil cores /
Campbell, D. J.(Duncan Joan),author.
Hunter, R.(Agricultural engineer),author.
Scottish Institute of Agricultural Engineering.
"Not for publication."--title-page.
"Scottish Institute of Agricultural Engineering."--at the head of the cover.
Report dated January 1983.
Includes bibliographical references (pages 13-14).
Penetrometers