The following resources provide further information on the history of Texas courthouses.
Publications (in alphabetical order)
The Courthouse Square in Texas - 2000, Robert E. Veselka & Kenneth E. Foote.
The Courthouses of Texas - 1962, Clark Coursey.
The Courthouses of Texas: A Guide - 1993, 2007, Mavis P. Kelsey & Donald H. Dyal.
Courtin' Texas: One Candidate's Travels Through Texas 254 Counties & their Courthouses - 1995, John W. Odam.
Gone From Texas; Our Lost Architectural Heritage – 1981, Willard B. Robinson.
Historic Texas Courthouses - 2006, Michael Andrews, Paul Hester & Lisa Hardaway.
Old Friends: Great Texas Courthouses - 1999, Bill Morgan & Ernest J. Hammond.
The People's Architecture: Texas Courthouses, Jails, and Municipal Buildings - 1983, Willard B. Robinson.
The Texas Courthouse - 1971 / The Texas Courthouse Revisited - 1984, June Rayfield Welch & J. Larry Nance.
Texas Justice: The Legacy of Historical Courthouses - 2004, Martana.
The Texas Judicial Cookbook - 2007, Dennis R. Mott.
Buck Schiwetz' Texas - 1960, Edward M. Schiwetz.
The Golden Age of Texas Courthouses - 2004, Texas Foundation for the Arts in association with Sunset Productions.
Texas Courthouse Websites
Texas County Courthouses - A set on Flickr
Texas County Courthouses - Daddy Bob Photos
Further information on Tower Clocks
AWCI - American Watchmakers-Clockmakers Institute