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Simmonds N.W., . Breeding horizontal resistance to South American leaf blight of rubber Hevea. pp. 102-113. ISSN 0127-7065
Simmonds N.W., . Gough and Chittenden: two rubber pioneers (Malaysia). 569-572 575. ISSN 0126-575X
Simmonds N.W., . Theoretical aspects of synthetic/Polycross populations of rubber seedlings. pp. 1-15. ISSN 0127-7065
Simmonds N.W., . A re-examination of some grafting experiments with rubber Hevea brasiliensis. pp. 30-41. ISSN 0127-7065