Heliògraf (telecomunicacions) (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "Heliògraf (telecomunicacions)" in Catalan language version.

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5^th place

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1enciclopedia.cat

1,148^th place

3^rd place

1royalsignalsmuseum.co.uk

low place

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enciclopedia.cat

«Heliògraf (telecomunicacions)». Gran Enciclopèdia Catalana. Barcelona: Grup Enciclopèdia Catalana.

royalsignalsmuseum.co.uk

«Royal Engineer Telegraph Troop and Heliographs» (en anglès). Early Communications. Royal Signals Museum.

worldcat.org

Woods, Daniel. «Heliograph and Mirrors». A: Sterling, Christopher. Military communications : from ancient times to the 21st century (en anglès). Santa Barbara, Califórnia: ABC-CLIO, 2008, p. 208. ISBN 978-1-85109-737-1.
Coe, Lewis. The telegraph : a history of Morse's invention and its predecessors in the United States. Jefferson, N.C.: McFarland, 2003. ISBN 0-7864-1808-7.