Some of the smaller skeletons are certainly on display. If you feel you can not believe your eyes you can go visit a skeleton at the Aztalan State Park where you can see the skeleton of a "Princess of Aztalan" . So what is the cover up then? The skeletons placed on display are normal-sized, and according to research I have done seem to end at the Smithsonian institute.
Kristan T. Harris
Anon. "Strange Skeletons Found: Indications that Tribe Hitherto Unknown Once Lived In Wisconsin," New York Times, 4 May 1912
Deloria Jr., Vine. Red Earth, White Lies: Native Americans and the Myth of Scientific Fact (Fulcrum Publications, 1997)
Sutherland, Mary. "Giants . . . Giants . . . Giants . . . Giants" A Big Page About Giants, BUFO Radio /