Well, it's a book, and a very large one at that, weighing in at 14.4 pounds per Amazon:

https://www.amazon.com/75-Years-Capitol-Records-XL/dp/3836550288

If you glance at the reviews in the link above, the main critique appears to be that not a lot of attention is paid to the label's first 20 years 1942-1962, which includes not only the KT's three landmark years of late 1958 through mid 1961 but also the heyday of great performers on Capitol like Judy Garland, Peggy Lee, and maybe Sinatra's greatest years 1953-61.

The KT outsold all other Capitol artists in LPs during those years, especially 1959 and 1960, but Sinatra's recording career stretched for more than 50 years and dozens of albums, with the vast majority of those across all labels (most on Capitol but a healthy number on Reprise as well) charting on Billboard Top Albums chart.

Mr. Google tells us that Ol' Blue Eyes sold over 150 million recordings in his career (and after his death, I presume). In the Trio's peak years of '58-'61, sources say that they sold 8 million recordings, 3 million of which were the "Tom Dooley" single. I'd make an educated guess that the ultimate number of KT recordings sold in it history could run as high as 12 million units - impressive for the time and the genre but clearly dwarfed by Sinatra before and the Beatles and many others after.

So - in the grand scheme of things, as for much of the last 50 plus years, I'm happy that the KT gets mentioned and remembered at all by an industry that generally has done neither.

However, I do believe that the KT still deserves a lot of credit that it doesn't get for changing not simply the content of pop music (and though folk influences started before the KT and continue to this day, the Trio was a major influence for several years) but the technology of the industry. Prior to the KT, the only LP that had certified sales of 1 million was Harry Belafonte's 1956 Calypso album. When the KT built a career selling far more albums than singles - at more income for them and more $$$ for Capitol - virtually all subsequent popular music acts re-focused on the album, both for its creative possibilities and for higher income that sales created.