by Douglas Pancoast...[et al.] by Douglas Biber...[et al.] Douglas Gunn...[et al.] by Colin Barrow ... [et al.] By Bo Arbogast...[et al.] by Allan Ben...[et al.] by Beryl Packer...[et al.] by George Ehrenhaft...[et al.] by Tom Masters...[et al.] Douglas Ehninger,... [et al.]