Blue-collar worker - Wikipedia

By A Mystery Man Writer

File:Filipino seaman.jpg - Wikipedia

1,500 Modernist Paintings Stolen by the Nazis Were Recovered from a Munich Apartment

Shotcrete - Wikipedia

File:Heilgymnastik an Zanderschen Apparaten.jpg - Wikipedia

File:CPS141ratpoison.jpg - Wikipedia

File:Hard Hat Worker HHW01.JPG - Wikipedia

File:Images from Wiki Loves Africa 2017 (2) Workers make palm leaves of fruit and vegetables.jpg - Wikimedia Commons

File:Caune de l'Arago 003.jpg - Wikipedia

Blue-Collar vs. White-Collar: What's the Difference?

Offen. Divers. Inklusiv. Thinking the Future of Organizations

When did the term 'blue collar' come into use for manual labor jobs? What made it become associated with that color of clothing? - Quora