800 blast furnaces.

Blast Furnaces of the world
The blast furnace, as one hears from its operators, will soon follow the dinosaurs and disappear.
Therefore, as a by-product of the pandemic time-out, a contribution to its history:
The nearly 800 blast furnaces existing in the western hemisphere (so called “free world”) in 1965.
Corrections are welcome.
But please note that this map refers to the year 1965.