… Zipf, “Field Ghosts:How the American Farmworker Fought Migrant Slavery, then Lost to H2A, 1975-1990” … GLC Brown … Zipf, “Field Ghosts:How the American Farmworker Fought Migrant Slavery, then Lost to H2A, 1975-1990” GLC Brown Bag: … 2018, “Field Ghosts: How the American Farmworker Fought Migrant Slavery, then Lost to H2A, 1975-1990” …