[396] Portugalli arcus, Domitians Triumphbogen in Rom, s.d. (n. Geogr.).
Brockhaus-1911: Arcus
Heiligenlexikon-1858: Arcus, S.
Herder-1854: Arcus
Lueger-1904: Arcus-Cosinus · Arcus
Meyers-1905: Arcus senīlis · Arcus
Pierer-1857: Arcus