[78-L] Charles Lindbergh's reception

[Bryan Wright]

I just got a copy of Victor 20747, Charles Lindbergh's reception at  
Washington, DC. Can anyone shed light on the process used to record  
this? Are these studio recreations of a radio broadcast or actual  
aircheck recordings?  I notice that the A side is take 5 and the B  
side is take 3 in the runout. Why wouldn't they both be take 1 if from  
airchecks? Perhaps it took multiple attempts to successfully "mix" the  
master recordings? Also, according to www.78discography.com, the  
matrix numbers for the two sides are nearly 500 numbers apart (mx.  
38955 and mx. 39413). Why so far apart?

Thanks,
Bryan