Which credit reporting agencies can I write to to get free credit reports?

Then Trans Union saw the early efforts of its competitors in collecting accounts receivables data by establishing a credit bureau reporting tape format. This required each company to write, test, and operate a special reporting system for updating on-line credit files. In addition, the company saw early attempts to deliver credit reports over teletype terminals using computer codes not familiar to the users, and requiring manual intervention for virtually every report. Trans Union did two things: