I clicked on the link you provided to the Library of Congress and then selected various newspaper articles at random.
Each of the articles I read is simply a re-working of the other: the same information regurgitated in the same order, almost verbatim in each case
It provides irrefutable evidence of one thing ... that journalism was as sloppy and as lazy almost one hundred years ago as it is today!
To see what I mean, I encourage you to look more closely at the wording of the following articles:
* Virginia Gazette, June 24th, 1905, Image 8
* Los Angeles Herald, April 23rd, 1905, Image 33
* The Colfax Gazette, July 21st, 1905, Image 6
It's the same article simply re-told. While I concur it's "kinda cool" that there are over 200 references to "giant skeletons" it's essentially one article re-told 200 times.
It calls to my mind a quotation often associated with the Nazis, referred to as the 'Big Lie' where Hitler is cited to have said: "If you tell a big lie and tell it frequently enough, it will be believed."
200 times in American newspapers, some might argue, is frequent enough for citizens to start believing in fabrication as truth.
Just a thought and as plausible as the notion of a "cover-up".