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Actions Displays	Details Remove from selection Add to selection Title Hugo Helt and the Rojas astrolabe projection / by Francis Maddison. Author Francis Maddison Francis Maddison, Description 61 pages :, 30 cm. Call Number QB85 .M24 1966 Subjects Rojas Sarmiento, Juan de, -- active 1544-1550., Helt, Hugo, -- approximately 1525-1594 or 1595., Astrolabes. Publishing Portugal--Coimbra: Junta de Investigações do Ultramar, 1966. Material Book

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