United States. Bureau of Labor Statistics. "National Compensation Survey: Amarillo, TX, June 1999 : Bulletin : Bulletin of the United States Bureau of Labor Statistics, No. 3100-01,"
National Compensation Survey (Wages and Salaries)
(December 1999).
https://fraser.stlouisfed.org/title/6009/item/582376/content/pdf/bls_3100-01_1999, accessed on July 18, 2026.