Postcard sent to John J. Herrera, Mike, and Shep in Houston, Texas from John's son, Douglas M. Herrera in Mexico. Text: "23 Sept 68, Dear Dad, Mike, Shep, San Luis is a pretty pace, muchas bonitas mujeres but I'm itching to get to la Ciudad D. F. So I'm catching the 11:30 A.M. bus out tomorrow so I can register for classes & begin the next day. Having a Corona on you all fellas. Wish me luck, I need it. DMH." The front of the postcard has images of four buildings in San Luis Potosi, identified on the reverse as Teatro de La Paz/La Paz Theatre, Plaza de los Fundadores/The Founders Square, La Caja del Agua/The Water Box, and Palacio de Gubierno/Government Palace.

Postcard to John J. Herrera and his wife Olivia from their son, Douglas M. Herrera. The postcard was mailed from Merida, Mexico to Houston, Texas and details the next portion of Douglas's journey and receipt of his father's telegram. The front image is of a hackney coach with "mestizas", two women standing in traditional dress in front of Saint John's Temple.

Postcard to John J. Herrera from Terry Serna that reads: "Hi Johnny! Still in the convention mood. Having a ball before returning to the grind! Terry Serna." The front of the postcard has the image of of a waterfall with people in the foreground. The image is identified on the back of the postcard as "Cascada La Cola De Caballo, Horsetail Falls near Monterrey. Monterrey, N. L., Mexico"

Undated postcard to John J. Herrera, signed "Les Argentinos", not postmarked. The handwritten note refers to a mutual acquaintance staying in Mexico who was recently ill. The color image on the front of the postcard shows a city with domed buildings surrounded by palm trees, identified on the back as G.P.O. and Garden, Bombay, India.

An undated postcard to John M. Herrera from his brother. The front of the postcard is a black and white image of a seated statue above the text, "Dios Viejo, c. 500, Old God, c. 500 A.D., Escultura de ceramica, Epoca Clasica, Cultura zapoteca, Museo Frissell de Arte Zapoteca, Mitla, Oaxaca, Mexico". The back of the postcard is addressed to John M. Herrera and contains a message from Herrera's brother who is traveling and asks Herrera to write to him when he can.

Postcard to John J. Herrera from El Rey Bonito is postmarked Monterrey, Mexico. The image on the front of the card is a building that is identified on the reverse of the card as "Palacio de Gobierno. Monterrey, N.L., Mexico." The handwritten notes reads, "Greeting to you Mr. Herrera. Regards to Miss Hernandez Mr. Fielder y al abogados Pansas El Lic Tazzo el chofer d Welch Ortiz El Rey Bonito".

Postcard of Francisco Villa y Estado Mayor and other Mexican Revolutionaries.

Postcard of General Emiliano Zapata.

Postcard of the assassination of General Francisco Villa.

Postcard of Don Miguel Hidalgo y Costilla, Mexico. He was a Mexican priest and a leader of the Mexican War of Independence.

Postcard of Felipe B. Berriozábal. He was a Mexican politician, engineer and military leader. He participated in the Reform War.

Postcard of people presenting gifts to Montezuma II, emperor of Mexico from 1480 to 1520.

Postcard of Princess Carlota Amalia, empress of Mexico from 1864 to 1867.

Postcard of Emperor Maximilian I and Empress Carlota of Mexico. They ruled from 1864 to 1867.

Postcard featuring two members of the military: Francisco Marquez, a military school student, and Juan Barrera, a lieutenant who died on September 13, 1847, at 19 years old.

Postcard featuring two members of the military: Vicente Suarez and Fernando Montes de Oca, both military college students who died on September 13, 1847, at 19 and 17 years old, respectfully. Both died defending the Chapultepec against an American attack.

Postcard of the scene of the Battle of Ocotlán. Troops converge on a town atop a hill.

Postcard of Emperor Maximilian I of Mexico. He ruled with his wife, Carlota, from 1864 to 1867.

Postcard of General Porfirio Díaz, Mexican soldier and politician, in a suit wearing a sash and a military medal. Díaz served seven terms as the President of Mexico.

Postcard of Justo Sierra, Mexican writer and journalist.

Postcard of Miguel Domínguez, a New Spanish colonial official in Mexico who played a part in the Mexican independence movement.

Postcard of Manuel González Flores, who has a long beard. González Flores was a military general, politician, and President of Mexico.

Postcard of Fray Pedro de Gante, a Franciscan missionary from Belgium. Gante was also known as Fray Pieter van der Moere and Pedro de Mura.

Postcard of Francisco Javier Mina. Mina was a solider and lawyer in Mexico who was a prominent figure in the Mexican revolution.