共 18 条
[2]
BOYD D. A., 1950, N.A.A.S. Quarterly Review, V10, P47
[3]
DONCASTER JP, 1948, 7 REP AGR RES COUN, P155
[5]
FINDLAY D. H., 1938, EMPIRE JOUR EXP AGRIC, V6, P253
[6]
TINLEY N. L., 1939, JOUR S EASTERN AGRIC COLL WYE, V44, P120
[7]
1931, SCOT J AGR, V14, P81
[8]
1935, SCOT J AGR, V18, P64
[9]
1933, SCOT J AGR, V16, P87
[10]
1925, 7 MIN AGR N IR LEAFL, P11