Braziliaanse verdedigingswerken

Egger, M.: Ein Besuch der brasilianischen Küstenbefestigungen von Santos und Rio de Janeiro.
In: DAWA Nachrichten
No. 34 (1999), p. 14-46; ill.; lit/br.opg.
[Brazilian coastal fortifications, equipped with armoured cupolas and heavy coastal guns made by Gruson and Krupp/Gruson]

Egger, M.: Coastal defenses of Rio de Janeiro and Santos.
Ein Besuch der brasilianischen Küstenbefestigungen von Rio de Janeiro und Santos.
Internetdocument URL: http://www.geocities.com/Pentagon/1630/brazil.htm
12 p.; ill.
[Brazilian coastal fortifications, equipped with armoured cupolas and heavy coastal guns made by Gruson and Krupp/Gruson]

Galvao, H.: Historia da fortaleza da barrado Rio Grande.
1979.
317 p.; ill.
[history of fortifications at the Rio Grande, in use from 1600 until 1970]