I don't know where to find a 1947 directory, but for 1946 :
google: nyc 1946 directory
on list of hits choose the one that says:
"New York City, New York Online Historical Directories...Google sites"
On new page for that site, scroll down to 1940's - under that you'll find Manhattan Telephone Directory 1940 & Manhattan Telephone Directory 1946. Both are Free to search.