ATLAS AMERICA PUBLIC #9 LTD.

Form 10-K for the year ended December 31, 2017
2018 Form 10-Q for the 3-months ended March 31, 2018

DGOC SERIES 18(B), L.P.

Form 10-K for the year ended December 31, 2017
2018 Form 10-Q for the 3-months ended March 31, 2018

DGOC SERIES 18(C), L.P.

Form 10-K for the year ended December 31, 2017
2018 Form 10-Q for the 3-months ended March 31, 2018

DGOC SERIES 28, L.P.

Form 10-K for the year ended December 31, 2017
Form 10-Q for the 3-months ended March 31, 2018