Intriguing discovery in a cave

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Possible Answers:

ART.

Last seen on: NY Times Crossword 9 Apr 20, Thursday

Random information on the term “ART”:

The American Refrigerator Transit Company (ART) was a St. Louis, Missouri-based private refrigerator car line established in 1881 by the Missouri Pacific and Wabash railroads. It is now a subsidiary of the Union Pacific Corporation.

American Refrigerator Transit Company, 1900–1970:

*estimated.

Source: The Great Yellow Fleet, p. 16.

ART on Wikipedia