Spanish-French leech trade and its consequences: From the increase in medical demand to resource depletion and technical innovation.

This figure is extremely significant, especially when compared with those obtained by other flagship products in Spain, such as citrus fruits, the exports of which amounted to 3.6 million reales. 45 Therefore, it is not surprising that Spanish documents of this period refer to the damage that was being done to the populations of leeches in the country.

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