Keywords
50 to 59 years, 55 to 59 years, 60 to 64 years, 60 to 69 years, adult, black, black color, blur, caucasian ethnicity, coal, coal mine, coal miner, coal mining, colleague, color, communicating, communication, day, differential focus, discussing, document, engineering, environment, environmental issue, focus, focus on foreground, focus techniques, fossil fuel, fuel, geology, goods, green, hard work, heavy industry, heavy machinery, high visibility clothing, holding, industry, interaction, issue, labor, landform, looking, machine, male, man, mature adult, mature man, mine, miner, mining, networking, old, older, only adults, only men, orange, orange color, organization, outdoors, paper, paperwork, planning, power, power industry, protective clothing, protective workwear, rock, rocks, saying, science collection, senior adult, senior man, shallow focus, stack, stand, standing, stands, stock, surface coal mine, surface mine, synergy, talking, team, teamwork, three quarter length, two people, white, work, working, working hard, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, u38421090