WWW BL OPAC, 10/07/2006---(P. Ludwig, publisher, Buenos Aires)
Tooley's dictionary of mapmakers, 1999-1003---(Ludwig P. Engraver of J.J. Castro's Map of the Railways of South America..., 1893)
Provincia de Corrientes, 1889---(Grabado P. Ludwig)
Gobernación de Santa-Cruz, 1886---(Grabado por Pablo Ludwig)
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