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Practical hints to scientific travellers / ed. by H.A. BrouwerPractical hints to scientific travellers / ed. by H.A. BrouwerPractical hints to scientific travellers / ed. by H.A. BrouwerPractical hints to scientific travellers / ed. by H.A. BrouwerPractical hints to scientific travellers / ed. by H.A. BrouwerPractical hints to scientific travellers / ed. by H.A. Brouwer