https://books.google.ru/books?id=ROR1xreEJTsC&pg=PA356&lpg=PA356&dq=chronology+of+Trade+Unions&source=bl&ots=CPTBMwJT3V&sig=nNHTB35P3oCyMephvSQdR5Yk5NU&hl=ru&sa=X&ved=0ahUKEwiUuZmq8NnKAhWjpnIKHSyhAI04HhDoAQgvMAM#v=onepage&q=chronology%20of%20Trade%20Unions&f=false
