As the Earth approaches what we might term planetary maturity, perhaps recognizable by the capacity of its inhabitants to discover and contact the elemental forces of the universe, intelligent forces from other parts of the cosmos seem to have discovered, and to be observing, Earth.
UK Files: http://www.nationalarchives.gov.uk/ufos/
UK Reports: https://www.gov.uk/government/publications/ufo-reports-in-the-uk
French Files: https://archive.org/details/FrenchUFOFiles/page/n1
Spain Files: http://bibliotecavirtualdefensa.es/BVMDefensa/i18n/consulta/resultados_ocr.cmd
Canada Files: https://www.collectionscanada.gc.ca/databases/ufo/index-e.html
Australian Files: http://www.naa.gov.au/collection/a-z/ufos.aspx
Brazil Files: https://archive.org/details/BrazilianUFOFiles