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| Author | Title | Year  |
Publication | Volume | Pages |
|---|---|---|---|---|---|
| Swoboda-Colberg, N.; Colberg, P.; Smith, J.L. | Constructed vertical flow aerated wetlands | 1994 | |||
| Amacher, M.C.; Brown, R.W.; Kotuby-Amacher, J.; Willis, A. | Adding sodium hydroxide to study metal removal in a stream affected by acid mine drainage | 1993 | Research Paper, US Department of Agriculture, Forest Service | 465 |