 Many out-of-state winemakers, the bulk of them from California, began migrating to the state, including Dick Erath, Dick and Nancy Ponzi, Susan and Bill Sokol Blosser of Sokol Blosser Winery, David and Ginny Adelsheim, Pat and Joe Campbell, Jerry and Ann Preston, and Myron Redford.In 1973, Oregon passed its landmark land-use law, which imposed strict separation between agricultural and urban uses of land via such mechanisms as the Urban Growth Boundary and Exclusive Farm Use Zones.This prevented many hillsides, deemed inappropriate for other crops which are easier to grow on flat fields, from being converted to housing.