Which service below was the first citator published as an aid to legal research in the United States?

Name: Which service below was the first citator published as an aid to legal research in the United States?
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Quizplus · Accepted Answer

Shepard's was the first citator published in the US, first appearing in 1873. KeyCite was first introduced in 1997, RIA Citator 2d was introduced in the 1960s, and Westlaw is a legal research platform that includes citator services but was not the first citator published.

Which Service Below Was the First Citator Published as an Aid