Photoessays Biography Credits	Checking the Oil Level
	Location: Monterey Co., CA Date: May 2, 1940 Agency: NYA Credits: Rondal Partridge (Photographer) Source: NARA (SPB) Accession Number: 119-CAL-10-114 Enlarged Image
	2 of 5 Checking the oil level on a caterpillar tractor. One of the most important parts of a skilled operator's job is the maintenance of his "cat."