Postcard of the U.S. Army 14th calvary on horseback entering Rio Grande City. Buildings are shown on either side of the calvary. Text on the front reads "14th Cav. entering Rio Grande City, April 30th."

Postcard of a camp at Roma, Texas. In the foreground there is open land and in the background there is a line of horses with buildings behind them. Text on the front reads "Camp at Roma, Texas. April 29, 1920. 262 miles from San Antonio."

Postcard of a group of dark-colored horses standing in a field by a military camp with a row of tents, trees, and a building visible in the background. A handwritten text on the front of the postcard reads "Zapata, Texas. Apr. 27/20. 216 Miles From San Antonio."

An envelope from the Southern School-Book Depository, postmarked April 24, 1920, with handwriting from C. C. Cox on it.

Postcard of a large group of horses and cavalry soldiers in a corral at a camp. In the foreground several men are standing next to horses who are drinking from troughs and behind them other soldiers are leading horses away to the other end of the corral. A large pipe is visible in the foreground on the left and trees and more horses can be seen in the background. A handwritten text on the front of the postcard reads "14th and 16th Cavalry Camp at Webb, Tex. April 22, 1920. 138 miles from San Antonio"

Postcard of a long line of soldiers on horseback in a field with shrubs and trees visible on the left. A text on the front of the postcard reads "Leaving Encinal April 21, 1920. 119 Miles from San Antonio."

Postcard of cavalry soldiers driving covered wagons pulled by horses down a dirt road with shrubbery on the left and right and telephone poles visible on the left. On the front of the postcard a hand-written text reads "Pulling out from Pearsall. April 18, 1920."

Letter from T. N. Hayter to C. C. Cox discussing a land survey. The envelope is included.

Postcard of a large group of cavalry soldiers on horseback in a field at Fort Sam Houston with two two-story buildings visible in the background. Several of the men in the center are holding tubas, trombones, and other musical instruments and on the front of the postcard a type-written text reads "Last Day at Ft. Sam Houston. April, 16th 1920."

Letter from the Southern School-Book Depository to C. C. Cox introducing an invoice for an order of books. The envelope is included.

Oath of office made by R. M. Calman for becoming a trustee of Montgomery County School District 15, approved by C. C. Cox.

Letter from state superintendent Annie Webb Blanton introducing two invoices for books from the Texas School Book Depository, dated February 11, 1920 and April 16, 1920. The letter includes instructions for mailing copies of the invoice back to the Texas Dept. of Education.