WILLCOX, Ariz. (AP) — A handful of voices softly chattering in Spanish filter into a building that's become the heart of Winchester Heights, a Willcox neighborhood filled with farmworkers. The community center is dedicated to connecting southeastern Arizona residents — with one another and with better health care.

As the clock nears 6 p.m., more men and women arrive, some coming straight from 10-hour shifts in the greenhouses of a tomato farm north of Willcox. Musculoskeletal problems, frequent exposure to excessive heat and long-term exposure to pesticides are common problems for Arizona agri...