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1.
Excreta Disposal for Rural Areas and Small Communities by Wagner, E. G., Lanoix, J. N. ISBN: 9789241400398 List Price: $28.00
2.
Water Supply for Rural Areas and Small Communities - E. G. Wagner - Hardcover by Wagner, E. G., Lanoix, J. N. ISBN: 9789241400428 List Price: $44.00