The efficiency of different animals
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Dugan, D. (2004). The efficiency of different animals [Video file]. http://www.dspace.cam.ac.uk/handle/1810/702
In answer to David Dugan, Joel Mokyr explains the different efficiency of certain animals, pigs, horses, cows, the nature of open field agriculture, the growing of fodder crops, camels and buffaloes.
This record's URL: http://www.dspace.cam.ac.uk/handle/1810/702