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Royalty Interests
6 Months Ended
Jun. 30, 2020
Real Estate [Abstract]  
Royalty Interests Royalty Interests
As of June 30, 2020 and December 31, 2019, the Trust owned the following oil and gas royalty interests (in thousands, except number of interests):
Net Book Value
June 30, 2020December 31, 2019
1/16th nonparticipating perpetual royalty interests$—  $—  
1/128th nonparticipating perpetual royalty interests —  —  
Royalty interests acquired46,265  29,320  
Total royalty interests, gross46,265  29,320  
Less: accumulated depletion(360) (260) 
Total royalty interests, net$45,905  $29,060  

No valuation allowance was necessary at June 30, 2020 and December 31, 2019.

For the six months ended June 30, 2020, the Trust acquired oil and gas royalty interests in approximately 1,017 net royalty acres (normalized to 1/8th) for an aggregate purchase price of $16.9 million, an average price of approximately $16,668 per net royalty acre.

For the six months ended June 30, 2019, the Trust acquired oil and gas royalty interests in approximately 1,247 net royalty acres (normalized to 1/8th) for an aggregate purchase price of $4.7 million, an average price of approximately $3,800 per net royalty acre.