The county has an inventory of sales that have occurred and the latest are stored on the CAMA (Computer Assisted Mass Appraisal) records. This data is collected through numerous sources some of which include deeds, sales letters to buyer and seller and in many cases actual telephone contact. View the O.S. §, Title 68. Revenue and Taxation, Chapter 1 - Tax Codes, Article 28 - Ad Valorem Tax Code, Section 2821, paragraph E for official details. The county assessor shall maintain a comprehensive sales file for each parcel of real property within the county containing relevant property characteristics, sales price information, adjustments to sales price for purposes of cash equivalency, transaction terms and such other information as may be required in order to establish the fair cash value of taxable real property.