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Every first appearance here links to the page that says so

A short list, checked by hand. Each row was read from the cited page on the date shown. The list carries no prices or values, because those move and need a different kind of source.

Cover date is given as precisely as the source gives it. DC's profiles state a year only. A character's first appearance is a fact about a story, and some names have had several holders, so the notes call that out where the source does.

First appearances as stated by the cited page. Cover date is given at the precision the source gives it (DC's profiles state a year only). No prices or values.