About McDonald Library The McDonald Observatory Library is located in the Otto Struve dome, home of the 82-inch telescope. The library serves the staff of the observatory, visiting astronomers and members of the Department of Astronomy. A variety of print and online resources in astronomy and related fields are available through the library. You may find that you need library materials that are not available at the McDonald Observatory Library. You may contact Elise Nacca at the Péridier Library or Molly White in the Physics-Math-Astronomy Library for help obtaining materials on the Austin campus or through InterLibrary Loan. more..