00515nam a2200121Ia 4500008004100000082000900041100002900050245008700079260004700166365000600213630008700219730008700306100415s9999 xx 000 0 und d b7240 aNational Resarch Council aResearch Studies Constituting Conribution To The International Biological Program aWASHINGTONc1967bNational Resarch Council b0 aResearch Studies Constituting Conribution To The International Biological Program aResearch Studies Constituting Conribution To The International Biological Program