The Macquarie/AAO/Strasbourg Hα Planetary Galactic Catalog (MASH) contains 905 true, likely and possible new galactic planetary nebulae discovered in the AAO/UKST Hα survey of the Southern galactic plane. The MASH catalog represents the result of a 7-year programme of identification and confirmatory spectroscopy. A key strength is that the entire sample has been derived from the same, uniform observational data. The 60% increase in known Galactic planetary nebulae represents the largest ever incremental sample of such discoveries and offers many new opportunities for research.
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