HOUSTON–(BUSINESS WIRE)–Natural Resource Partners L.P. (NYSE:NRP) today reported second quarter 2021 results as follows:     For the Three Months Ended   Last Twelve Months Ended (In thousands) (Unaudited)   June 30, 2021 Net income   $ 15,382     $ 45,666   Asset impairments   16     7,661   Net income excluding asset impairments (1)   $ 15,398     $ 53,327   Adjusted EBITDA (1)   27,351     100,233   Cash flow provided by (used in) continuing operations:         Operating activities   13,38