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Field methods of water hardness determination | Bok | 551.49 D Douglas, Ian / - London : British geomorphological research group, 1968. - 35 s. (Technical bulletin : no. 1) - Språk: Engelsk | Douglas, Ian | 1968 |
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Techniques for the tracing of subterranean drainage | Bok | 551.49 D Drew, David P. / - London : British geomorphological research group, 1969. - 36 s. (Technical bulletin : no. 2) - Språk: Engelsk | Drew, David P. | 1969 |