| 6501 | ROARING RUN | Armstrong County, PA | Gas Property | Dec 2025 |
| 6502 | ROARING RUN UNIT | Lycoming County, PA | Gas Property | Dec 2025 |
| 6503 | ROBBINS | Clearfield County, PA | Gas Property | Dec 2025 |
| 6504 | ROBBINS BRA | Bradford County, PA | Gas Property | Dec 2025 |
| 6505 | ROBERT | Jefferson County, PA | Gas Property | Dec 2025 |
| 6506 | ROBERT | Indiana County, PA | Gas Property | Dec 2025 |
| 6507 | ROBERT | Crawford County, PA | Oil & Gas Property | Dec 2025 |
| 6508 | ROBERT | Armstrong County, PA | Gas Property | Dec 2025 |
| 6509 | ROBERT | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 6510 | ROBERT | Armstrong County, PA | Gas Property | Dec 2025 |
| 6511 | ROBERT | Jefferson County, PA | Gas Property | Dec 2025 |
| 6512 | ROBERT | Erie County, PA | Oil & Gas Property | Dec 2025 |
| 6513 | ROBERT | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 6514 | ROBERT | Armstrong County, PA | Gas Property | Dec 2025 |
| 6515 | ROBERT | Jefferson County, PA | Oil & Gas Property | Dec 2025 |
| 6516 | ROBERT | Warren County, PA | Gas Property | Dec 2024 |
| 6517 | ROBERT | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 6518 | ROBERT | Indiana County, PA | Gas Property | Dec 2025 |
| 6519 | ROBERT | Indiana County, PA | Gas Property | Dec 2017 |
| 6520 | ROBERT | Indiana County, PA | Gas Property | Dec 2025 |
| 6521 | ROBERT | Erie County, PA | Gas Property | Dec 2025 |
| 6522 | ROBERT & PAULETTE | Indiana County, PA | Gas Property | Dec 2025 |
| 6523 | ROBERT A HOY | Clarion County, PA | Gas Property | Dec 2025 |
| 6524 | ROBERT ALLISON L | Clarion County, PA | Gas Property | Dec 2025 |
| 6525 | ROBERT BOLDIN | Indiana County, PA | Gas Property | Dec 2025 |
| 6526 | ROBERT BOWERSOX | Clarion County, PA | Gas Property | Dec 2025 |
| 6527 | ROBERT BOYD SPENCE | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 6528 | ROBERT BURN | Clarion County, PA | Gas Property | Dec 2025 |
| 6529 | ROBERT BURNS | Clarion County, PA | Gas Property | Dec 2025 |
| 6530 | ROBERT BUSH | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 6531 | ROBERT BUTERBAUGH | Indiana County, PA | Gas Property | Dec 2025 |
| 6532 | ROBERT C ALLISON | Clarion County, PA | Gas Property | Dec 2025 |
| 6533 | ROBERT C LEVIN ET UX | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 6534 | ROBERT C ULMER A | Lycoming County, PA | Gas Property | Dec 2025 |
| 6535 | ROBERT C. CRISSMAN | Armstrong County, PA | Gas Property | Dec 2025 |
| 6536 | ROBERT C. HILLEN ETUX | Fayette County, PA | Gas Property | Dec 2025 |
| 6537 | ROBERT COLEMAN | Clarion County, PA | Oil & Gas Property | Dec 2025 |
| 6538 | ROBERT D | Crawford County, PA | Gas Property | Dec 2024 |
| 6539 | ROBERT D | Indiana County, PA | Gas Property | Dec 2025 |
| 6540 | ROBERT E PATRICK | Armstrong County, PA | Gas Property | Dec 2025 |
| 6541 | ROBERT E WISSINGER | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 6542 | ROBERT GRAHAM | Westmoreland County, PA | Gas Property | Dec 2025 |
| 6543 | ROBERT H NEHRIG | Indiana County, PA | Gas Property | Dec 2025 |
| 6544 | ROBERT HAMI | Jefferson County, PA | Gas Property | Dec 2025 |
| 6545 | ROBERT HITCHCOCK | Crawford County, PA | Gas Property | Dec 1990 |
| 6546 | ROBERT HOLDER | Mercer County, PA | Oil & Gas Property | Dec 2020 |
| 6547 | ROBERT HOUSER | Armstrong County, PA | Gas Property | Dec 2025 |
| 6548 | ROBERT J CITERONI | Indiana County, PA | Gas Property | Dec 2025 |
| 6549 | ROBERT J FABIN | Indiana County, PA | Gas Property | Dec 2025 |
| 6550 | ROBERT J. DILTS FMLY ROY R | Indiana County, PA | Gas Property | Dec 2025 |
| 6551 | ROBERT KESTER | Clearfield County, PA | Gas Property | Dec 2025 |
| 6552 | ROBERT L. CALHOUN | Armstrong County, PA | Gas Property | Dec 2025 |
| 6553 | ROBERT M | Indiana County, PA | Gas Property | Dec 2025 |
| 6554 | ROBERT M LENHART | Westmoreland County, PA | Gas Property | Dec 2025 |
| 6555 | ROBERT MITCHELL 8 | Indiana County, PA | Gas Property | Dec 2025 |
| 6556 | ROBERT MURPHY | Westmoreland County, PA | Gas Property | Dec 2025 |
| 6557 | ROBERT N BROTHERS | Clearfield County, PA | Gas Property | Dec 2025 |
| 6558 | ROBERT OSGOOD | McKean County, PA | Gas Property | Dec 2025 |
| 6559 | ROBERT SAWYER | Clarion County, PA | Gas Property | Dec 2025 |
| 6560 | ROBERT SHORTS | Washington County, PA | Oil & Gas Property | Dec 2025 |
| 6561 | ROBERT SMITH | Washington County, PA | Gas Property | Dec 2025 |
| 6562 | ROBERT SPENCER | Erie County, PA | Gas Property | Dec 2018 |
| 6563 | ROBERT SPENCER | Clearfield County, PA | Oil & Gas Property | Dec 2025 |
| 6564 | ROBERT STRONG | Indiana County, PA | Gas Property | Dec 2025 |
| 6565 | ROBERT V MAINE | Jefferson County, PA | Gas Property | Dec 2025 |
| 6566 | ROBERT W. GRAY FM AT | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 6567 | ROBERTA B JONES | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 6568 | ROBERTS | Greene County, PA | Gas Property | Dec 2015 |
| 6569 | ROBERTS 59 | Greene County, PA | Gas Property | Dec 2025 |
| 6570 | ROBERTS BEA | Beaver County, PA | Gas Property | Dec 2025 |
| 6571 | ROBERTSON | Armstrong County, PA | Gas Property | Dec 2025 |
| 6572 | ROBINHILL | Washington County, PA | Oil & Gas Property | Dec 2025 |
| 6573 | ROBINSON | Susquehanna County, PA | Gas Property | Dec 2025 |
| 6574 | ROBINSON | Armstrong County, PA | Gas Property | Dec 2025 |
| 6575 | ROBINSON | Bradford County, PA | Gas Property | Dec 2025 |
| 6576 | ROBINSON | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 6577 | ROBINSON | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 6578 | ROBINSON 82 | Indiana County, PA | Gas Property | Dec 2025 |
| 6579 | ROBINSON CAMPBELL 11132 | Washington County, PA | Gas Property | Dec 2025 |
| 6580 | ROBINSON FERGUSON | Bradford County, PA | Gas Property | Dec 2025 |
| 6581 | ROBY GROSE | Jefferson County, PA | Oil & Gas Property | Dec 2025 |
| 6582 | ROCHESTER & PGH | Clearfield County, PA | Gas Property | Dec 2024 |
| 6583 | ROCHESTER & PGH C | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 6584 | ROCHESTER & PGH COAL | Jefferson County, PA | Gas Property | Dec 2024 |
| 6585 | ROCHESTER & PGH COAL | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 6586 | ROCHESTER & PGH COAL | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 6587 | ROCHESTER & PGH COAL CO | Jefferson County, PA | Gas Property | Dec 2025 |
| 6588 | ROCHESTER & PGH COAL CO | Jefferson County, PA | Gas Property | Dec 2025 |
| 6589 | ROCHESTER & PGH COAL CO | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 6590 | ROCHESTER & PITT | Indiana County, PA | Gas Property | Dec 2025 |
| 6591 | ROCHESTER & PITTS | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 6592 | ROCHESTER & PITTSBURG | Armstrong County, PA | Gas Property | Dec 2025 |
| 6593 | ROCHESTER & PITTSBURGH CO | Indiana County, PA | Gas Property | Dec 2025 |
| 6594 | ROCHESTER & PITTSBURGH COAL CO | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 6595 | ROCHESTER & PITTSBURGH COAL CO | Indiana County, PA | Gas Property | Dec 2025 |
| 6596 | ROCHESTER & PITTSUBRGH COAL CO | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 6597 | ROCHESTER&PITTSBURGH COAL | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 6598 | ROCK FURNA | Armstrong County, PA | Gas Property | Dec 2025 |
| 6599 | ROCK RUN | McKean County, PA | Oil Property | Dec 2025 |
| 6600 | ROCKEFELLER (05-275-0 | Susquehanna County, PA | Gas Property | Dec 2025 |