00511nam a22001217a 4500008004100000040005500041080001600096245016400112260006200276300001300338650001200351700002600363230529b        |||||||| |||| 00| 0 eng d  aNational Science LibrarycNational Science Library  a577.17 bL7  aProcedures used at the national bureau of standards to determine selected trace elements in biological and botanical materials c/ U. S. Department of Commerce  aWashington, D. C.: bU. S. Department of Commerce, c1977  ax, 287p.  aScience  aMavrodineanu, R (Ed.)