004210000a22001450004500020001500000082001900015100002100034100002100055100002300076245005700099260002800156260000900184300000800193650007400201  a0123261406  a574.873 28 HAR  aHarmon, Robert E  aRobins, Ronald K  aTownsend,  Leroy B  aChemistry and biology of nucleosides and nucleotides  aNewyork, Academic press  c1978  a468  aChemistrry - nucleosides/ Chemistry - nucleotides Biology Nucleotides