https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12308923![Cinder block plant which supplies cinder block for the Greenbelt Project, Maryland. Sourced from the Library of Congress.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDIyLTA0L2xvYzIwMTc3MTU3NjMtaW1hZ2UuanBn.jpg)
![Cinder block plant which supplies cinder block for the Greenbelt Project, Maryland. Sourced from the Library of Congress.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDIyLTA0L2xvYzIwMTc3MTU3NjMtaW1hZ2UuanBn.jpg)
Cinder block plant which supplies cinder block for the Greenbelt Project, Maryland. Sourced from the Library of Congress.
Cinder block plant which supplies cinder block for the Greenbelt Project, Maryland. Sourced from the Library of Congress.
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