共 6 条
[1]
BOYD RJ, 1967, FARM CONSTRUCTION IN
[2]
EXTENDED OCTAGONAL RING TRANSDUCER FOR USE IN TILLAGE STUDIES
[J].
JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH,
1975, 20 (04)
:347-352
[3]
OSMAN MS, 1964, THESIS U DURHAM
[4]
ROGERS OJJ, 1955, NIAE105 TECH MEM
[5]
HAND-HELD GAMMA-RAY TRANSMISSION EQUIPMENT FOR MEASUREMENT OF BULK DENSITY OF FIELD SOILS
[J].
JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH,
1971, 16 (02)
:146-+
[6]
Weber J. A., 1964, J TERRAMECHANICS, V1, P56