by Douglas Pancoast...[et al.] by Douglas Pancoast...[et al. by Douglas Biber...[et al.] by Douglas Biber...[et al. Douglas Gunn...[et al.] By Bo Arbogast...[et al.] Douglas Ehninger,... [et al.] Douglas Gunn...[et al. by Allan Ben...[et al.] by Fu Gang...[et al.]