Some targets

NYPL has papers of historian and folklorist Kenneth W. Porter papers (1912-1984)
See "Porter's Personal Library 1946"
We'd have to go to the archives for it.
https://archives.nypl.org/scm/20684#detailed

Arthur Tress, photographer
https://en.wikipedia.org/wiki/Arthur_Tress
https://ccp.arizona.edu/sites/ccp.cals.arizona.edu/files/finding-aid-pdfs/ag149_...
Complete list is online.
Apparently Tress is still alive, albeit 80.

James Hammond Trumbull, 19c American historian
See https://digitalrepository.trincoll.edu/cgi/viewcontent.cgi?referer=https://www.g...
"Furthermore, the library owns nearly one hundred and fifty books from Trumbull’s personal library, allowing researchers to explore his marginalia."
They are referring to The Watkinson Library, Trinity College Hartford.

A catalog was apparently made, see https://ctw-tc.primo.exlibrisgroup.com/discovery/fulldisplay?docid=alma992695037...
226pages, available offline various places.

Mr. George Brinley, Boston book collector (1817-1875)
Catalogue of the American library of the late Mr. George Brinley. Index

Full versions available on Hathi and elsewhere.
https://catalog.hathitrust.org/Record/100251356
Crazy-huge.

Dorothy M. Johnson Papers, 1844-1984
http://archiveswest.orbiscascade.org/ark:/80444/xv35229

"Dorothy Johnson was a Montana writer known for her Western fiction. The collection consists of the personal and literary collection of Miss Johnson, and has particularly complete coverage of her literary career."

"A card file that appears to be a record of the books in her personal library, many of which were not retained in this series."

If anyone is in Missoula, MT…

Eve Ball papers, 1855–1984
Brigham Young University

"A noted oral historian, Ms. Ball authored a series of influential articles and books on the history of the Apache Indians and the American Southwest. She died December 24, 1984."

"Additional materials document her personal library and the sale of her book collection"

Jack London!

Okay, so as I gather his 15k books were all burned? But substantial records exist, compiled in this book:
The Tools of My Trade: The Annotated Books in Jack London's Library (1986)

I need to get this book!

GEORGE C. MARSHALL RESEARCH LIBRARY
https://www.marshallfoundation.org/library/wp-content/uploads/sites/16/2014/07/2...
Lexington, VA 24450

William F. Friedman Papers William Frederick Friedman (1891-1969) was an American cryptologist, considered by experts to be the greatest of all time. The papers consist of general correspondence (1942-1969); government service papers; Congressional Relief Bill material; patents; speeches and writing; numerically indexed papers; and photographs. Correspondence with cryptographers of national and international renown can also be found. Friedman’s private cryptological work on such subjects as the Voynich manuscripts, codes and ciphers of ancient cultures, and the authorship of Shakespeare’s work are also treated in the collection. Also to be found is a personal library of 110 linear feet, 18 linear feet of vertical file material, and 12 linear feet of artifacts.

Harvey A. DeWeerd Papers - The papers include Harvey A. DeWeerd’s (1902-1979) correspondence and documents relating to his military career as contributing editor for the Army Infantry Journal, as well as his dissertation, bibliographies, lectures, and reading notes compiled in preparation for teaching and for writing Great Soldiers of Two Wars (1941), Selected Speeches of George Catlett Marshall (1945) , and President Wilson Fights His War: World War I and the American Intervention (1968). Also found are research items, including papers given DeWeerd by Basil H. Liddell Hart, reprints of articles and book reviews and newspaper clipping files on détente and nuclear war. DeWeerd’s extensive personal library is also among the Marshall Library’s holdings.

Gerald Ford
"Finally, this collection contains two series of books from Gerald Ford's library in his offices and residences in Rancho Mirage, California and Vail Colorado. The criteria for choosing these books are unknown. Most have been signed/inscribed by the author, contributor, subject of the book, or by the person who gave the book to Ford. Many of the books include Gerald Ford's personal bookplates or he annotated that it was his “personal copy."

The books themselves are listed on that page, so this might be easy:
https://www.fordlibrarymuseum.gov/docroot/library/guides/findingaid/fordspecmat....

It looks like Will Roger's personal library is still at his ranch, which is now a home museum.
See https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&c...

Roger's was apparently a Cherokee citizen.