00281nam a22001097a 4500003000400000008004100004082002000045100001500065245006300080260002000143300000800163OSt240129b        |||||||| |||| 00| 0 eng d  a581.13342bV87F  aVogel,J.C.  aFractionation of the carbon isotopes during photosynthesis  aNew york c1980  a135