Tax Map Number Explaination?

[Webb Sledge]

Our county uses a tax map number in the format "Map, Insert, DblCircle, Block, Lot" according to our appraisal network. An example attached to a real property may be listed as "075D 2 18."

Can anyone explain this to me? What part of that example corresponds to what? I'm trying to find all the properties in a certain neighborhood, or at least on a street, and I can't seem to figure out what each bit is named.