Meghan Milbrath is an assistant professor of entomology at Michigan State University. She has some excellent information on practical varroa control on her site. Check it out!

http://www.sandhillbees.com/

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Michael Palmer is a world-famous beekeeper (I bet you didn't know those existed) located in the Champlain Valley of Vermont. His talks on apiary sustainability taught me the basics of keeping my apiary running without buying loads of bees from other beekeepers. Plus the photos on his site are beekeeper eye candy!

https://www.frenchhillapiaries.com/

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Randy Oliver is a biologist and beekeeper in California. He runs his bees for almond pollination and honey production. He details his various experiments on his site for the scientifically minded beekeeper.

https://scientificbeekeeping.com/