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These are the NSW topographic map boundaries, extracted from the NSW DTDB (Digital Topographic Database) as at 22/04/2016. The maps are a mix of 1:25000, 1:50000 and 1:100000. Most NSW maps are a standard size:
Some maps, typically those on parts of the coast, are only half as wide, to avoid printing large amounts of sea. A few are slightly larger, to avoid printing an extra map. One map (Bombo Point) has a separate inset, and one map (Caloola, on the Queensland border) is not rectangular in shape.