Photograph of a dagger flat sign in Big Bend National Park. Various desert vegetation is growing throughout the surrounding area.

Photograph of a view of Casa Grande and The Window from Lost Mine Peak in Big Bend National Park. Trees and other plant life are growing throughout the area.

Photograph of yucca in full bloom in Big Bend National Park. The Chisos Mountains are located in the background of the photo.

Photograph of a view of Boquillas, Mexico towards Texas overlooking the Rio Grande River flood plain. A wooden shed is located on the right side of the photo and vegetation is growing throughout the surrounding area.

Photograph of a flower and old lumber along Lost Mine Peak Trail. Other plant life is growing throughout the surrounding area.

Photograph of a home in Baytown, Texas having experienced the negative effects of subsidence. The house has rectangular doors and windows varying in shape and size. There is a white van and multiple bicycles parked outside the home. The surrounding area is flooded and marshy with foliage growing out of the water.

Photograph of Barbara Gibbs and Evelyn Streng in front of their tent at a Rio Grande Village Campground in Big Bend National Park. A picnic table is located on the right side of the photo and various plant life is growing throughout the surrounding area.

Photograph of a view of Boquillas Crossing at Rio Grande River in Big Bend National Park looking across the river towards Boquillas, Mexico. Mexican citizens are located on the other side of the river with horses and trucks. There is various plant life growing throughout the surrounding area.

Photograph of a view of Casa Grande and The Window from the top of Lost Mine Peak. There is plant life located in the foreground of the photo.

Photograph of blooming cactus on the Lost Mine Peak Trail in Big Bend National Park. A hand is extending from the left hand side of the photo and is touching the cactus flowers. Various plant life is growing around the area.

Photograph of a blooming giant dagger in Big Bend National Park.

Photograph of Texas Lutheran University students crossing Boquillas Crossing in rowboats from Mexico back to Texas in Big Bend National Park. Various plant life is growing on both sides of the river.

Photograph of dagger flat in Big Bend National Park. There are blooming giant daggers and other desert vegetation growing throughout the surrounding area.

Photograph of a blooming giant dagger in Big Bend National Park.

Photograph of Boquillas Canyon and the Rio Grande River in Big Bend National Park. There is some plant life growing along the river's edges.

Photograph of Mexican children selling rocks to Barbara Gibbs in Big Bend National Park. There are structures located in the background and an individual is riding off into the distance on the back of a donkey. Various vegetation is growing throughout the area.

Photograph of a view towards The Window from the top of Lost Mine Peak. Barbara Gibbs is standing in the foreground of the photo and there is various plant life growing throughout the surrounding area.

Photograph of a wide angle view of Casa Grande on Lost Mine Peak trail. Barbara Gibbs is standing in the bottom left hand corner of the photo and there is vegetation growing throughout the surrounding area.

Photograph of the Old Main building on the Texas Lutheran College campus during it's demolition in the summer of 1977. There is a lawn pictured in front of the demolition site along with one light pole and small trees. The interior of the building is visible and the upper floors have nearly been demolished. Piles of debris can be seen around the demolition site.

Photograph of the Old Main building on the Texas Lutheran College campus during it's demolition in the summer of 1977. The demolition of the upper floors is nearly completed and the interior of the rooms are visible. Large piles of debris can be seen around the site along with two trees in the photograph.

Photograph of the demolition progress of the Old Main building on the Texas Lutheran College campus. The photo is taken near the completion of the buildings demolition and shows the remaining debris left at the site. Two men can be seen walking on a pathway near the demolition site. There is a grassy area pictured in the foreground of the picture that contains three small plants and a light post.

Photograph of a man harvesting pecans on the campus of Texas Lutheran College. He is using a long stick to get ripe pecans loose from the pecan trees. A man is gathering pecans from underneath the tree, and cars are visible in the background.

Photograph of the Old Main building on the Texas Lutheran College campus during it's demolition in the summer of 1977. The building is shown in the early stages of demolition and parts of the interior can be seen. Windows are missing from their frames and debris is visible around the demolition site. There are three men seen standing outside of the building that appear to be working on the demolition.

Photograph of the central towers of the Old Main building located on the Texas Lutheran College campus. The photograph was taken at the beginning stages of the building's demolition that occurred in 1977. There is a wire fence in the foreground of the photograph and the building can be seen in the background with missing windows and a small amount of debris.