1942, December 2 Physicists at University of Chicago achieve first nuclear chain reaction.

NORTH DAKOTA - Cavalier County

Roxy Theatre (added 1998 - - #98001341) Also known as 32CV527 714 Third St. , Langdon Historic Significance: Event, Architecture/Engineering Architect, builder, or engineer: Welworth Enterprises, Marshall, John Architectural Style: Early Commercial Area of Significance: Architecture, Social History Period of Significance: 1925-1949 Owner: Private Historic Function: Recreation And Culture Historic Sub-function: Theater Current Function: Recreation And Culture Current Sub-function: Theater US Post Office--Langdon (added 1989 - - #89001752) Also known as Langdon Post Office 323 Eighth Ave. , Langdon Historic Significance: Event, Architecture/Engineering Architect, builder, or engineer: Wetmore,James A. Architectural Style: Other Area of Significance: Politics/Government, Economics, Art, Architecture, Community Planning And Development Period of Significance: 1925-1949 Owner: Federal Historic Function: Government Historic Sub-function: Post Office Current Function: Government Current Sub-function: Post Office

The Hocking Hills Geological History on Display

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