Zepp, G.A. Producing fresh tomatoes in California and baja California : Costs and competition / G.A. Zepp, R.L. Simmons. - Washington, DC : U.S. Department of Agriculture. Economics, Statistics, and cooperatives service, 1980. - 37 p. : tables ; 26 cm. Footnotes References: p. 23 Subjects--Topical Terms: Tomatoes--costs