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Two scientists in protective masks and suits examining fish and writing in clipboard near river

Female scientist in protective mask and suit writing in clipboard while her colleague putting sample of water

Male scientist in protective mask and suit opening working suitcase while his female colleague writing in clipboard

Male scientist in protective suit and mask holding fish by tweezers near river

Serious male scientist in protective mask and suit writing in clipboard near water outdoors

Selective focus of female scientist in protective mask and suit writing in clipboard while her colleague putting sample of water near river outdoors

Male scientist putting sample of water in test flask while his female colleague writing in clipboard near sewerage

Scientists in protective masks and suits examining fish and writing in clipboard outdoors

Pest control worker spraying pesticides on street with sprayer

Pest control worker in respirator spraying pesticides with sprayer on building wall

Low angle view of pest control worker standing with sprayer

Cropped image of male scientist in latex gloves taking sample of stone by tweezers outdoors

Portrait of pest control worker in respirator looking at camera

Pest control worker in respirator holding sprayer

Pest control worker spraying pesticides on street

Cropped image of pest control worker spraying pesticides with sprayer on building wall