00303nam a2200097Ia 4500008004100000082002300041100003900064245005200103260004200155300000800197140113s9999    xx            000 0 und d  a047.1:577.4   L7.8  a"Johnson, Richard. F. & Michener,"  aAnnual Review of Ecology and Systametics -vol.8  a1977bAnnual Reviews Inc.cCalifornia  a490