Ahhh, the age of the Stearman Crop Dusters!  I spent many years chasing them all over Northern California. This beauty was one of ten or more of Davis Dusters at Colusa, California, in February 1965.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/34076827@N00">Bill Larkins</a>
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/34076827@N00/11975725744/">Stearman PT-17 Sprayer</a>