a geochemical assessment model for environmental systems version 3.0 user's manual Allison, Jerry D. creator Brown, David S. Novo-Gradac, Kevin J. text gau Athens, Ga Environmental Research Laboratory 1991 monographic eng viii, 106 p. ill. 28 cm. general by Jerry D. Allison, David S. Brown, and Kevin J. Novo-Gradac. Metals Water Metal content Chemical equilibrium EP 1.23:600/3-91/021 tlc00025064 920212 20160527183338.0 45035