FIRST AMENDED AND RESTATED CREDIT AGREEMENT DATED AS OF FEBRUARY 14, 2008 AMONG VANGUARD NATURAL GAS, LLC, AS BORROWER, CITIBANK, N.A., AS ADMINISTRATIVE AGENT, AND THE LENDERS PARTY HERETO CO-LEAD ARRANGER, SOLE BOOKRUNNER AND CO- SYNDICATION AGENT...Credit Agreement • March 31st, 2008 • Vanguard Natural Resources, LLC • Crude petroleum & natural gas • Texas
