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Hugo Helt and the Rojas astrolabe projection / by Francis Maddison Book Publication Coimbra : Junta de Investigações do Ultramar, 1966
Description 61, [1] desdobr. : 10 il. ; 29 cm LocationBiblioteca Vitorino Magalhães Godinho Availability Available (1). Reference (1).

Medieval scientific instruments and the development of navigational instruments in the XVth and XVIth centuries / by Francis Maddison Book Publication Coimbra : Junta de Investigações do Ultramar, 1969
Description 60 p., [8] f. : 56 il. ; 29 cm LocationBiblioteca Vitorino Magalhães Godinho Availability Reference (1).