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GRABE, D.F. (ed.) 1970. Tetrazolium Testing Handbook for Agricultural Seeds. Contribution No. 29
       to the Handbook on Seed Testing,  AOSA. Figure 8, Bermudagrass.
originally appeared  in:
Delouche, J.C., T. W. Still, M. Raspet, and M. Lienhard. 1962.  The tetrazolium test for seed viability. 
        Miss. Agric. Exp. Sta. Tech. Bull. 51.