Id these old car years?

Old pic, probably 1930s, but would welcome any attempts to narrow down the time frame.

Third car from the left?
http://www.flickr.com/photos/myoldpostcards/3427389235/in/photostream/

Possibly 1937 or '38. Agree with california jobcase on the '36 Plymouth. The transition from the boxy "body-on-frame styling of the 1920’s to the more rounded, unibody aerodynamic look began ca.1935 with the Chrysler “Airflow” design and other qutomakers quickly followed suit. The second car from left has the older styling, while the Plymouth shows the newer. I cannot tell much from the first car on the left, it has some body rounding, but old-style spoked wheels while the Plymouth has more modern solid rims.
SS