.....The Colorado Postal History Society was formed in 1979 by a small group of collectors dedicated to sharing and preserving their knowledge in all areas of Colorado Postal History. This group established "The Colorado Postal Historian" as the organization's official newsletter with the first issue published in October. Under the able editorship of Bill Grebe and Robert Munshower, the society was able to published sixteen issues.
.....During the annual meeting in 1978, some reorganization was undertaken and William H. Bauer, one of the authors of "Colorado Postal History - The Post Offices" published in 1971 and "Colorado Post Offices - 1859 - 1989" published in 1989, became editor. Under Mr. Bauer's editorship, the society has been able to publish four issues per year. Currently the society is publishing the "Colorado Postal Encyclopedia" as part of the "Colorado Postal Historian".
.....The "Colorado Postal Encyclopedia", written by William H. Bauer, is a county by county thesis providing town site information, postmaster listings, and tracings of all recorded postal markings. During the past ten years Mr. Bauer and co-author James L. Ozment have traveled the state to visit and photograph all of the accessible post offices locations. With a few exceptions, this travel was completed in May , 2002.
Over 4500 pages have been written to date. Published counties include: Adams, Alamosa, Arapahoe, Archuleta, Baca, Bent, Boulder, Chaffee, Cheyenne, Clear Creek, Conejos, Costilla, Crowley, Custer, Dolores, Douglas, Eagle, Elbert, El Paso, Fremont, Garfield, Gilpin, Grand, Gunnison, Hinsdale, Jackson, Jefferson, Kiowa, Kit Carson, Lake, La Plata, Lincoln, Logan, Mesa, Mineral, Moffat, Montrose, Morgan, Motezuma, Otero, Phillips,  Pitkin, Rio Blanco, Rio Grande, Saguache, San Juan, San Miguel, Sedgewick, Summit, Washington, Weld counties.
.... In addition, express company markings used in Colorado have been published as a part of the "Encyclopedia" and Denver County was published in issues prior to the start of the "Encyclopedia" in 1998.(Click here to view sample pages of the "Colorado Postal Historian and Encyclopedia".)