Residues of organochlorine pesticides, polychlorinated biphenyls, and mercury in bald eagle eggs and changes in shell thickness--1969 and 1970 - Wiemeyer, Stanley; Mulhern, B.M.; Ligas, F.J.; Hensel, R.J.; Mathisen, J.E.; Robards, F.C.; Postupalsky, S. (Pesticides Monitoring Journal, 1972)