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Figure 16. Jim Mason and Frank Erwin laying brick foundation for the first addition to the 

 BEB laboratory building (seen in background). The addition was to provide 

 office space for the Board's staff, 27 October 1939. 



Figure 17. Walls going up on the addition to the BEB's facility on Dalecarlit Reservation, 

 Washington, D.C., winter, 1939-40. 



41 



