00305nam a2200109Ia 4500082002700000100002000027245010600047260002400153300000800177500000500185700000500190  aSFb304.02853 Se471.ED  aClubb, Jerome M  aEcological data in comparative research; report on a first international data confrontation seminarb  aParisbUNESCOc1970  a37p  a  a