How do I see all previous output from a completed terminal command?

I've executed a command in gnome terminal that printed more output to the terminal than I expected. I'd like to read the entire output, but the terminal scroll stops before reaching the beginning.

I understand that I can change the terminal profile settings to enable unlimited scrolling, or pipe the output to a file, etc. All of these common solutions apply to future output, however.

How do I view the complete terminal output of a command that has already been executed?

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