Two types of tractor four-wheel drive engage alarm for use on slopes /
Owen, G. M.(Gwilym Morris),1936-2010,author.
Scottish Institute of Agricultural Engineering.
"Not for publication."--title-page.
"Scottish Institute of Agricultural Engineering."--at the head of the cover.
Report dated May 1984.
Errata slip loosely inserted.
Includes bibliographical reference (page 7).
Farm tractors