Cox, Elizabeth.
Improving subsistence agriculture a basic ingredient for development by E. Cox and J. W. Tyler. - 1980. - 12 leaves.
Agriculture--Papua New Guinea.
Papua New Guinea--Economic conditions.
Improving subsistence agriculture a basic ingredient for development by E. Cox and J. W. Tyler. - 1980. - 12 leaves.
Agriculture--Papua New Guinea.
Papua New Guinea--Economic conditions.