The Erlen Group is a family of industrial companies focusing on aggregates, logistics and real estate. The Erlen Group operates the Springfield Underground, a 3.2 million sq. ft. network of subsurface warehouses. Although mining ceased and Springfield Underground in 2015, the Erlen Group operates three additional limestone quarries: Joplin Stone, in Joplin, Mo., opened in 1955. Westside Stone, in…
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