X0101 EFFECT 33 LIVE 2013-05-20 09:00:00

S-4

0000315852 RANGE RESOURCES CORP 333-188173 0001463704 American Energy Systems, LLC 333-188173-09 0001476516 Energy Assets Operating Co, LLC 333-188173-08 0001298982 Range Resources - Appalachia, LLC 333-188173-07 0001463706 Range Resources - Midcontinent, LLC 333-188173-06 0001320967 Range Resources Pine Mountain, Inc. 333-188173-05 0001362961 Range Texas Production, L.L.C. 333-188173-04 0001095640 RANGE ENERGY SERVICES CO, LLC 333-188173-03 0001320972 Range Operating New Mexico, LLC 333-188173-02 0001497664 Range Production Co /DE/ 333-188173-01