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1Publicado em 1992“...British Library,...”
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Recurso Electrónico livro electrónico -
2Publicado em 1970“...National Agricultural Library,...”
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Recurso Electrónico Periódico -
3
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Archived copy available at the National Library of New Zealand
Recurso Electrónico Periódico -
4Publicado em 1989“...British Library Document Supply Centre,...”
Recurso Electrónico Periódico