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Where would one find information on these?
Go to the website of the Precancel Stamp Society (the US one not the British.)
On their homepage click Styles and Devices. Then Click Here For The PSS Style Sheet. Download this. It contains illustrations and descriptions of each type.
Next return to the homepage. This time click Free Precancel Albums For Download. Then Free Precancel Albums. Then choose a format (it doesn't much matter which). Then choose the State you are looking for. Then go through the alphabetical pages until you find the town you need. There will be spaces for each known type for that town with a number underneath. Make a note of these numbers. Then look these numbers up in the style sheet and see which one matches your stamp.