William E. Thomas, born 1852, was a businessman and a city and county official of Phoenix, AZ. He served as postmaster of Phoenix from 1894 to 1898 and of Liberty, AZ in 1901 and again in 1905. The collection includes correspondence, reports, bills, legal documents, and financial records pertaining to Thomas' activities in real estate, mining, business, politics, and his public service as postmaster. Along with records of his time serving as clerk of Maricopa County Board of Supervisors and clerk of Maricopa County Superior Court. There are mining records for various locations chiefly the Blue Bird Mine and Prince of Arizona Mining Company.