The use of a simple penetrometer in field tillage studies /
Soane, B. D.(Brennan D.),author.
Campbell, D. J.(Duncan Joan),author.
Herkes, S. M.,author.
National Institute of Agricultural Engineering (Great Britain).Scottish Station.
Unbound.
"SSN/67."--cover leaf.
Report dated February 1971.
Includes bibliographical references (page 9).
Tillage
Penetrometers.