X0101 EFFECT 33 LIVE 2010-02-04 0001144204-10-005040 POS AM 0001433834 Atlas Resources Public #18-2008 Program 333-150925 0001432987 Atlas Resources Public #18-2008 (A) L.P. 333-150925-03 0001432985 Atlas Resources Public #18-2009 (B) L.P. 333-150925-02 0001433833 Atlas Resources Public #18-2009 (C) L.P. 333-150925-01