Energy stocks have been having a rough go this year, as the -9.63% year-to-date return of the Energy Select Sector SPDR Fund (XLE

) clearly demonstrates. Yet, this is no reason to completely write off the energy sector, especially for investors with a longer-term perspective. The closed-end Adams Natural Resources fund (PEO), despite being primarily focused on the energy sector, has managed to provide an annualized total return of 7.1% over the past 15 years. The fund carries a four-star rating from Morningstar and has been the No. 1 performing fund in its category over the past five, 10 and 15 year periods, according to Barron’s.

With the fund’s team of analysts and managers, lead by CEO and senior portfolio manager Mark Stoeckle, fairly confident that crude oil prices will be in the high $40 to mid-$50 range for the next while, here are nine stocks they think could outperform their peers: Albermarle Corp., DowDuPont Inc., Andeavor, Exxon Mobil Corp., Chevron Corporation, Schlumberger NV, Haliburton Co., Weatherford International PLC, and Diamondback Energy Inc. (To read more, see: