![Labeled diagram of the Apollo spacecraft used for the ASTP mission indicating major Apollo spacecraft changes from the Skylab configuration](https://www.nasa.gov/wp-content/uploads/2024/01/as-15.png)
Apollo-Soyuz Test Project: Major Apollo spacecraft changes from the Skylab configuration
From The Partnership: A History of the Apollo-Soyuz Test Project, NASA SP-4209, page 226.
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From The Partnership: A History of the Apollo-Soyuz Test Project, NASA SP-4209, page 226.