| John Barwis | Philadelphia Exchange Office Mails |
| Stan Bednarczyk | Lackawanna County |
| Glenn Blauch | Lebanon County |
| Ron Breznay | Luzerne County |
| Mike Burke | Braddock, Greencastle, Rankin, Swissvale |
| Tom Clarke | Philadelphia Postal History |
| Richard Colberg | Litiz (Lititz) |
| Gerald Cross | Wilkes-Barre |
| Dave Crossland | Reading and Berks Counties |
| Roger Curran | Lewisburg to 1900, Fancy Cancels |
| Allison Cusick | Fayette and Somerset Counties, Machine Cancellations |
| George Danyliw | Philadelphia and Schuylkill Counties |
| Charles DiComo | U.S. Postal History, 3 cent 1851-57 Issue, Lancaster County, Stampless Transatlantic via NYC |
| William Dixon | Wyoming County, Fakes and Forgeries |
| John Dowd | PIke and Wayne Counties, Sullivan County, NY |
| Barry Elkins | Philadelphia County |
| Neal Erkes | Philadelphia |
| Helen Galatan-Stone | Philadelphia Buildings prior to 1900 |
| Charles Hessler | Luzerne and Monroe Counties, NEPA Coal Mining |
| Tom Horn | Huntingdon and Centre Counties, Gettysburg |
| Steve Kennedy | US & WW 1840-1900, Philadelphia Postal History, Philadelphia Cancels (SON)(CDS), Philadelphia Precancels, Switzerland, France |
| Van Koppersmith | Philadelphia Maritime Markings |
| David Latzko | York County |
| Rick Leiby | Pennsylvania Stampless |
| Gordon Mathis | Warren County |
| Tom Mazza | Erie, Western Pennsylvania |
| Bob McKain | Pittsburgh, Pennsylvania Machines |
| Lloyd Mitchell | Southwest Pennsylvania, Washington County RFD’s |
| Letty Moon | Southeastern Pennsylvania Counties |
| Gordon Morison | Bradford County |
| Vern Morris | Philadelphia, Locals |
| Bud Newman | Pennsylvania Stampless |
| Norm Nicol | Luzerne and Wyoming Counties |
| Al Parsons | Chemung, Steuben, Schuyler Counties, NY |
| Larry Pettinger | Susquehanna County |
| Andrew Reid | Great Britain Transatlantic Mail to Pennsylvania, pre-1865 |
| Robert G. Rufe | Bucks County |
| Bill Schultz | West Chester,West Whiteland & West Town |
| Mark Schwartz | Pennsylvania Postmaster Franks, Pittsburgh 1st Federal Handstamp |
| Norm Shachat | Philadelphia and Bucks County |
| Robert Shaub | York County |
| Dave Silcox | Schuylkill and Berks County |
| Don W. Smith | Johnstown and Cambria County |
| Gus Spector | Philadelphia, Buildings, Civil War |
| Anita Sprankle | North Central DPO’s, Sewing Machines |
| Ron Summers | Philadelphia Ad Covers |
| Gordon Trotter | Nathan Trotter & Co. Correspondence |
| Dan Telep | Economy, Sewickley, Western Pennsylvania |
| Bill Thoman | U. S. Stampless Covers, Dealer |
| Joe Volutza | Berks County, Dealer |
| Steve Washburne | Philadelphia, Portugal |
| Harry Winter | Centere County, Railroads |
| Cliff Woodward | Western Pennsylvania, Oil Towns |
| Ronald J. Yeager | Elk, Cameron, and McKean Counties |
| Chet Zaremba | Nanticote and Pennsylvania covers |
| Robert Noble | Lancaster County PO’s, classic precancels (pre-1900), revenues, US general |
