Some websites I use to help identify buses:

North American Buses:
http://cptdb.ca/wiki/index.php?title=Main_Page
http://www.etspe.ca/index.html


South American Buses:
http://todoxautobusweb.tripod.com/
http://www.valespbus.com/
http://www.galeon.com/cyberbuses/

Japanese Buses:
http://www5e.biglobe.ne.jp/~iwate/vehicle/extra/primer/

http://busexplorer.com/main.php
En voici un autre.

Là on trouve des autobus de Paris : http://www.amtuir.org/01_musee/01_musee_collection.htm

fsebus is convinced that this one is a Yellow Coach Z-63:
http://www.imcdb.org/vehicle_193092-unknown.html
And after doing some meager research, I'd have to agree. Still waiting for comments and/or corrections.

fsebus seems to know his stuff, and my knowledge of buses from the 1930s is pretty much zero, so I would trust him