Some of the primary sources now located online at
http://library.bea.gov/  may help shed some light on the state of
macroeconomic thought during the 1930s and 1940s in the U.S., much of
which is not uniquely Keynesian.  

For instance, check out the early NBER conference volumes on measuring
income and wealth (CRIW) from 1937 and 1938. 

This website is in development if anyone cares to comment.  

Richard Kane