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Zombie Master Mappack

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Please note: I take no credit for any of these maps. If the original creators ask me to take this down I will do so.
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This pack contains the following maps:
zm_backwoods_b4
zm_basin_b3fix
zm_bluevelvet_rc1
zm_countrytrain_b4
zm_diamondshoals_a2
zm_downtown_v1
zm_forestroad
zm_gasdump_b4
zm_gilmanhouse_v2
zm_mine_shaft_v1
zm_sanatorium_b6
zm_substation_b10

Enjoy!
Also, if you have Left 4 Dead 2 content mounted, some of the maps will have weird visual glitches for some reason.

Alternatively, this addon is https://garrysmods.org/download/63/zombie-master-mappack