These are very basic, multi-purpose, generic, cheap medicines.
You may be surprised by how simple and widely effective many of these medicines are.
Many of them are anti-parasitic meds. Many of the meds can cheaply be purchased for your livestock at a feed supply store.
I would download the 2019 edition (or earlier), not a more recent edition.
W.H.O. List of Essential Medicines. 21st List 2019
https://apps.who.int/iris/bitstream/handle/10665/325771/WHO-MVP-EMP-IAU-2019.06-eng.pdf
The core list presents a list of minimum medicine needs for a basic health-care system, listing the most
efficacious, safe and cost–effective medicines for priority conditions. Priority conditions are selected on the
basis of current and estimated future public health relevance, and potential for safe and cost-effective
treatment.