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1,699 media by topicpage 1 of 17
[San Juan de Ulúa /

[San Juan de Ulúa /

Ground plan of a projected fortress.

Planimetriam, hoc est, longitudinum mensuram per astrolabium experíri

Planimetriam, hoc est, longitudinum mensuram per astrolabium experíri

Print shows an astrolabe being used to measure a tower.