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Correct hygienic disposal of manure in Ethiopia. Colour lithograph for Health Education Centre, 1997.

Specification of William Parry and John Frearson : treating sewage.

Specification of William Strang : separating sewage.

The manures most advantageously applicable to the various sorts of soils, and the causes of their beneficial effect in each particular instance / By Richard Kirwan.

Specification of William Footman : treating sewage.

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Manures

Catalogue

Correct hygienic disposal of manure in Ethiopia. Colour lithograph for Health Education Centre, 1997.

Specification of William Parry and John Frearson : treating sewage.

Specification of William Strang : separating sewage.

The manures most advantageously applicable to the various sorts of soils, and the causes of their beneficial effect in each particular instance / By Richard Kirwan.

Specification of William Footman : treating sewage.