Eldon D. Enger [et al.]. Eldon D. Enger ...[et al.]. Eldon D. Enger...[et al.]. Donald F. Elger [et al.]. Gordon J. Alexander [et al.]. Eldon D. Enger, Bradley F. Smith. Eldon D. Enger, Frederick C. Ross. Arun D. Singh ... [et al.]. cEldon D. Enger, Frederick C. Ross. Gregory D. Hager ... [et al.