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Lansberge Triangulorum geometriae libri quatuor . Book Lansberge Philippe van Triangulorum geometriae libri quatuor apud Guiliemum Blaeuw Amsterdami lat it Philippi Lansbergii Triangulorum geometriae libri quatuor in quibus nova perspicua methodo apodeixei tota ipsorum triangulorum doctrina explicatur Ad senatum populumque Middelburgensem