Alberti Dvreri pictoris et architecti praestantissimi De vrbibvs, arcibvs, castellisque condendis, ac muniendis rationes aliquot : praesenti bellorum necessitati accommodatissimae : nunc recens è lingua Germanica in Latinam traductae (1535)
Dürer, Albrecht, 1471-1528 · Parisiis : Ex officina Christiani Wecheli, sub scuto Basiliensi · leaf 57
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Fortification · Fortification -- Early works to 1800
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
