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http://www.kimmacquarrie.com/category/did-a-german-discover-machu-picchu/

http://peru.icomos.org/MPbeforeB.pdf

http://theonlyperuguide.com/peru-guide/machu-picchu/a-short-history/

http://www.elmundo.es/america/2011/06/27/noticias/1309127773.html

http://bestof.answers.com/q/was_herman_goering_a_cartographer_in_peru

https://lamula.lamula.pe/2011/06/27/machu-picchu-la-ciudad-que-nunca-estuvo-pardida/admin/

http://www.qosqo.com/qosqoes/bingham/shtml

http://www.taringa.net/posts/info/3200215/aleman-saqueo-machu-picchu-antes-de-hallazgo.html

http://formentinatura.wordpress.com/2013/01/08/machu-picchu-i-lo-que-buscaba-hiram-bingham-what-hiram-binghams-was-searching-for/