McCarrison, farmyard manure and the future.
Yellowlees
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D000383:Agriculture / Q000266:history* / Q000639:trends; D000818:Animals; D000829:Animals, Domestic; D005308:Fertilizers / Q000266:history*; D058870:Food, Organic / Q000266:history; D049673:History, 20th Century; D006801:Humans; D008372:Manure; D012606:Scotland
D005308:Fertilizers; D008372:Manure