Please note that you will need to make arrangement beforehand to gain access to materials in the Bush Library:
"Before conducting on-site research at the George Bush Presidential Library, researchers must submit a researcher application and complete a brief orientation. The researcher application is available below in a fillable PDF format. Researchers may choose to bring the completed forms to the orientation, send them to us via email, or complete them upon arrival. However, please do not sign the documents until you arrive at our facility for orientation, and please remember to bring a valid English language photo ID. Additionally, researchers may find it helpful to review the Research Orientation PowerPoint before arrival at our facility.
You will also want to prepare so you know what is available and what to ask for. There is a finding aid to documents here: https://bush41library.tamu.edu/archives/finding-aids/
The George Bush Library and Museum is open to researchers although it is advised that arrangements be made prior to showing up. They have detailed information on using the Library's Collections: