The book on Uhura's lap

Introduction to Klingon Grammer was a textbook on the Klingon language.

It was one of the books used by the crew of the USS Enterprise-A in 2293 to present themselves as a Klingon vessel. (Star Trek VI: The Undiscovered Country)

In an ironic production mistake, the book's title should have been correctly spelled as "Introduction to Klingon Grammar."
The book was a modified version of the 1951 catalog for Alloy Steel Products, Inc. [1]
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