Subject
- Bee culture7
- Bee culture -- Economic aspects -- Oregon2
- Pesticides -- Environmental aspects2
- Alfalfa -- Seeds1
- Alfalfa leafcutter-bee -- Parasites -- Control1
- Bees1
- Bees -- Effect of pesticides on1
- Bees -- Effect of pesticides on -- Safety measures1
- Honeybee1
- Megachile1
- Megachile rotundata -- Parasites -- Control1