… GLC Brown Bag: Karin Zipf, “Field Ghosts:How the American Farmworker Fought … Slavery, then Lost to H2A, 1975-1990” … GLC Brown Bag: Karin Zipf, “Field Ghosts:How the American Farmworker Fought … Slavery, then Lost to H2A, 1975-1990” GLC Brown Bag: Karin Zipf, GLC Visiting Fellow, Sept.-December 2018, “Field …