|Competition Series (C1 - C6)||
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C4 To Find a King and C5 Bane of Llywelyn form the "Prophecy of Brie" series, and were originally published as RPGA modules 5, 6, 7, and 8, in Polyhedron newsletters 16, 17, 18, and 19, respectively. Both modules come with a double cover (module booklet nested inside two covers of maps). Thanks to Eric Pass for help with this info.
Modules C1 Hidden Shrine of Tamoachan and C2 Ghost Tower of Inverness each have multiple printings, described on their respective pages -- follow the links to them. Modules C4 - C6 have no distinguishable printings.
C3 Lost Island of Castanamir
Newman for this info.
Lost Island of Castanamir
To Find a King
Bane of Llywelyn