Proceedings of the meeting of the ISSS working group on soil information systems, Wageningen, 1–4 September, 1975
1977 ◽
Vol 140
(1)
◽
pp. 109-110
1978 ◽
Vol 141
(2)
◽
pp. 251-251
1989 ◽
Vol 15
(3)
◽
pp. 395-401
◽