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World sulphur survey / William F. Sheldrick Monografia Publication Washington : World Bank, cop. 1984 Description XXI, 170 p. : il. ; 28 cm LocationBiblioteca Geral da Universidade do Minho Availability Available (1).

An outlook for fertilizer demand, supply, and trade, 1988/89-1993/94=1988/ 89- 1993/ 94 / Kurt M. Constant, William F. Sheldrick Monografia Publication Washington : The World Bank, 1991 Description X, 110 p. : il. ; 28 cm LocationBiblioteca Geral da Universidade do Minho Availability Available (1).

World nitrogen survey / Kurt Michael Constant, William F. Sheldrick Monografia Publication Washington : The World Bank, 1992 Description XXVI, 190 p. : il. ; 28 cm LocationBiblioteca Geral da Universidade do Minho Availability Available (1).