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Credit
An easy mode of ascertaining the capabilities of soil : tests for the purity of artificial manures : mode of preserving the fertilizing contents of a dung-heap from escape, &c. &c. / by John Robinson. Public Domain Mark. Source: Wellcome Collection.
Provider
This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.