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| 020 | _a9780813672984 | ||
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| 082 | _a525 | ||
| 100 |
_aColin Walker _91225 |
||
| 245 | _aOur Changing Earth : Concept Science | ||
| 260 |
_aUnited States _bModern Curriculum Press _c31 Dec 1989 |
||
| 300 |
_a17 Pages _bPaperback |
||
| 650 | _aClean water and sanitation | ||
| 942 |
_2ddc _cBK _06 |
||