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Conservative party manifesto:
https://s3.eu-west-2.amazonaws.com/manifesto2017/Manifesto2017.pdf
Labour party manifesto:
http://www.labour.org.uk/page/-/Images/manifesto-2017/Labour%20Manifesto%202017.pdf
Libdem party manifesto:
Wordclouds generated with http://www.wordclouds.com/
Read my research on the construction of immigrants in the UK legislation and admin informative texts:
Constructing immigrants in UK legislation and Administration informative texts: A corpus-driven study (2007–2011), Discourse & Society, 28,1,81-103