Quarterly report pursuant to Section 13 or 15(d)

Royalty Interests

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Royalty Interests
9 Months Ended
Sep. 30, 2019
Real Estate [Abstract]  
Royalty Interests Royalty Interests
As of September 30, 2019 and December 31, 2018, the Trust owned the following oil and gas royalty interests (in thousands, except number of interests):
Net Book Value
September 30, 2019 December 31, 2018
1/16th nonparticipating perpetual royalty interests $ —    $ —   
1/128th nonparticipating perpetual royalty interests —    —   
Royalty interests acquired 29,320    24,303   
Total royalty interests $ 29,320    $ 24,303   

No valuation allowance was necessary at September 30, 2019 and December 31, 2018.

For the nine months ended September 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.

There were no oil and gas royalty interest transactions for the nine months ended September 30, 2018.