Wirth, M. E. Changing farmland values in the western region : 1960-1989 - Pullman : Washington State University, 1990 - 23 p. ; gráfs. - Research bulletin ; X131018 . - Research bulletin ; X131018 . 56-97 LCCN: 5152 Subjects--Topical Terms: Tierras--E.U.A.Tierras--Valoración.