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Here are a couple Community articles that should give you the information you are after:
Set a Hidden Form Field From a Default Value, a URL Parameter or a Cookie
Hope this helps!
But does that mean I have to create a separate landing page for each source I want to track? (i.e. a landing page/URL for the email blast, a landing page/URL for the website, etc.)
You don't have to create a seperaete LP for each source. You just create url parameters for each source, and then the form will capture those parameters.