4 1 50 Abrecht, Paul Primary Author Birch, Charles Primary Author Paul, Abrecht Primary Author mixed material 0080182100 Geneva Pergamon Press 1975 Birch, Charles Primary Author mixed material 0896224538 American Twenty-third Pubicaton 1990 Ethical Issues in genetic engineering Birch, Charles Primary Author mixed material 2825407410 Geneva World Council of Churches 1982 Birch, Charles Primary Author mixed material 2825405787 Geneva WCC 1978