Watts S. Humphrey
Ralf Kneuper
Dumitru Teaci
Kangsheng Zhao
Food and Agriculture Organization of the United Nations. Soils Resources, Management and Conservation Service, FAO Land and Water Development Division.
Kenneth M. Dymond
Dennis M. Ahern
Hans Staden
Unknown Author
Donald Mackney
Séverine Deneulin
British Columbia. Dept. of Agriculture.
United States. Soil Conservation Service
Andrew McGregor
Daiikki Keikaku Hōnō Ishoku Suiden Kōhochi Chōsahan
Minami Manshū Tetsudō Kabushiki Kaisha. Keizai Chōsakai. Nōgyō oyobi Ishokuminhan
Nobukage Satō
Yūzō Abematsu