by Kummer, D.M
Published in University of Chicago geography research paper (USA) (1992)

by Kummer, D.M, Turner, B.L. II
Published in Bioscience (01.05.1994)

by Kummer D.M
Published in Policy Paper Series (Philippines). no. 11 (1984)

by Kummer, D.M. (Clark University, Worcester, MA)
Published in Photogrammetric engineering and remote sensing (01.10.1992)

by Kummer, D.M
Published in Policy Paper Series (Philippines) (1984)

by Kummer, D.M. (Clark Univ., Worcester, MA (USA))
Published in Agroforestry systems (01.04.1992)