I've Stumbled Upon A Few Lots Of Vintage Philatelic Publications. What Do I Have Here?

I'm new to the hobby, just a lone, baby stamp collecting creature trying to make his way into this World. I recently stumbled upon a few philatelic publications and I'm hoping to pull from the hive mind here... What do I have? How rare are they? And what might be the value? The "Philadelphia Stamp News" magazines are nowhere to be found online but the man behind this magazine, Eugene Klein, is of course famous for passing on one of the most valuable set of stamps ever collected in the World.

Thank you!

Check the Philatelic Union Catalog online. Both the APRL and Spelman have runs for 1895 and 1910-1915. If you have issues outside that year range, consider a donation to APRL, a better way to serve the hobby than trying to cash in. Outside libraries, the market for these is likely very small. You would have to show that a particular issue contains a groundbreaking article that would interest an exhibitor or researcher, in my opinion, to expect to sell an issue for more than a few dollars.

I am willing to digitize them and make them freely available to the hobby if desired. It is a non-destructive process and the the PDF would be fully searchable. I have done this for various other public domain publications and they are available on Stamp Smarter.
Don

What Chris said. Not so much financial worth but great for research. For instance this quote from a Siegel 314A description:

"All of the Scott 314A stamps that exist in unused condition originate from a local Detroit stamp collector, Karl Koslowski, who was the only one to purchase some of the 4c Imperforates--either from the Winfield Printing Company or from the Schermack firm. His earliest account of the event appeared two years later in the Philadelphia Stamp News, and is considered to be the most reliable of several conflicting stories told by Koslowski (and interpreted by others) at later dates. In the 1910 article, Koslowski explains that he purchased 50 stamps and expected to be able to buy more, but the supply was destroyed when he returned. We can account for 32 of the 50 stamps Koslowski claims he acquired. There are 21 unused stamps currently in our census, all of which must have come from him, and he used at least 11 stamps on mail to friends, including the strip of three on a Koslowski cover, two used strips of three off cover (the mass mailings were all singles) and two singles on separate Koslowski covers. The earliest known cover is dated at Detroit on May 27, 1908, from Koslowski to a friend in Austria, and the latest is dated April 8, 1909, which was mailed to him using a sheet-margin single from Sicklerville, New Jersey. Apart from the stamps Koslowski used, there is one recorded commercial cover (June 2, 1908) and approximately 32 used single stamps, most of which were probably removed from the mass-mailing covers."

I overlooked Don and Stamp Smarter. His offer should be seriously considered.

Percy McGraw Mann began Philadelphia Stamp News in 1911. Mann was involved with the stamp trade until his death in 1927 and I'm wondering if he, at some point, sold the periodical to Klein and when? Klein's ads had a prominent place on the cover of most issues and I wonder if that may be causing some confusion as to who actually published it.

What are the names of the publications and what year range do you have for each?

Dale