Question: What frequency is the magazine, in which the Texas Football Classic appears, published?

Context paragraphs:
2003 Silicon Valley Football Classic: The 2003 Silicon Valley Football Classic was a post-season college football bowl game between the UCLA Bruins and the Fresno State Bulldogs on December 30, 2003, at Spartan Stadium in San Jose, California.  It was the fourth time the Silicon Valley Football Classic was played and the final game of the 2003 NCAA Division I-A football season for both teams.  Fresno State defeated UCLA 17–9.  It was the sixth time the two teams had met on the field and the first victory for Fresno State.

Atlanta Football Classic: The Bank of America Atlanta Football Classic was an annual football classic game between two historically black colleges and universities.  The game has since been replaced by the Celebration Bowl HBCU championship game.

2001 Silicon Valley Football Classic: The 2001 Silicon Valley Football Classic was a post-season college football bowl game between the Michigan State Spartans and the Fresno State Bulldogs on December 31, 2001, at Spartan Stadium in San Jose, California.  It was the second time the Silicon Valley Football Classic was played and the final game of the 2001 NCAA Division I-A football season for both teams.  Michigan State defeated Fresno State 44–35.

2004 Silicon Valley Football Classic: The 2004 Silicon Valley Football Classic was a post-season college football bowl game between the Troy Trojans and the Northern Illinois Huskies on December 30, 2004, at Spartan Stadium in San Jose, California.  It was the fifth and final time the Silicon Valley Football Classic was played and the final game of the 2004 NCAA Division I-A football season for both teams.  Northern Illinois defeated Troy 34-21.

Mr. Football Award (Texas): The Mr. Texas Football Award is an honor given to the top high school football player in the state of Texas.  It is awarded by "Dave Campbell's Texas Football" magazine.  The award was established in 2007.

Red River State Fair Classic: The Red River State Fair Classic (formerly the State Fair Classic and, more recently, the Shreveport Classic) is an American college football game played annually in Shreveport, Louisiana, at Independence Stadium (formerly State Fair Stadium) during the State Fair of Louisiana.  It traces its historical lineage from a series of 160 games played over the 106 football seasons between 1911 and 2016.  By having first paired historically black colleges and universities in 1922, the contest holds the distinction of being the oldest annual black college football classic, edging out the Turkey Day Classic by two years and the similar Texas State Fair Classic by three years.  Also, so far, the earliest documented use of the term "classic" as part of an annual black college football game's formal name has been dated to the 1927 Louisiana State Fair Classic.

Texas Football Classic: The Texas Football Classic is a high school football event that takes place at the beginning of each football season at the Alamodome in San Antonio, Texas.  It was started in 1999 by the staff of "Dave Campbell's Texas Football", an annual football publication that highlights every high school, college, and professional team in the state of Texas.  Since then, it has grown from three games to five and spans three days, usually over Labor Day weekend.

West Texas Rufneks: The West Texas Rufneks were a professional American football team based in Midland, Texas.  They began play as the Odessa-Midland Comets in the Texas Football League in 1966.  In September 1968 the franchise was purchased by Dallas investor Alton Fairchild, who changed the team's name to the West Texas Rufneks.  When the Texas Football League merged with the Continental Football League for its 1969 season, the Rufneks became a member of the CFL's new Texas Division East.  The team announced plans to relocate after the 1969 season, but the move never happened and the Rufneks dissolved before the 1970 Texas Football League season.

Dave Campbell's Texas Football: Dave Campbell's Texas Football is an biannual magazine previewing American football teams in the state of Texas.

Barton Koch: Barton "Botchey" Koch (April 22, 1907 – April 28, 1964) was an American college football player.  He was the first consensus All-America football player from the Southwest Conference.  He was elected to the Baylor Sports Hall of Fame in 1961, the Texas Sports Hall of Fame in 1967 and the College Football Hall of Fame in 1974.  He was named to the All Time Texas High School Team by "Texas Football" magazine in 1968 and to the "50-Year Super Stars" of the Southwest Conference by Texas Football magazine in 1969.  In 1984, he was added to the Texas High School Football Hall of Fame.

Supporting paragraphs: Texas Football Classic Dave Campbell's Texas Football
Answer: biannual