00380nam a2200097Ia 4500008004100000082001800041100003700059245010600096260007300202300000700275140113s9999    xx            000 0 und d  a631.4:55   L2  a"Ritchey, S.J. & Cairns,J., Ed."  aEcology of land : Symposium sponsored by society of the Sigma X1 and Center for Environmental Studies  a1972bVerginia Polytechnic Inst. & State Univ.cBlacksburg(Verginia)  a49