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13 bytes added ,  07:33, 20 April 2014
Added missing PMID for Rodahl 1949
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Lewis, R. W., and J. A. Lentfer. 1967. The vitamin A content of polar bear liver: range and variability. Compar. Biochem. Physiol. 22:923-926.  
 
Lewis, R. W., and J. A. Lentfer. 1967. The vitamin A content of polar bear liver: range and variability. Compar. Biochem. Physiol. 22:923-926.  
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Rodahl, K. 1949. Toxicity of polar bear liver.  Nature 164:530.  
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Rodahl, K. 1949. Toxicity of polar bear liver.  Nature 164:530. PMID 18141621
    
Rodahl, K. 1950 Hypervitaminosis A in the rat. J Nutr. 41:399-421 PMID 15428909
 
Rodahl, K. 1950 Hypervitaminosis A in the rat. J Nutr. 41:399-421 PMID 15428909