Unique Historic Treasures Preserved by Spray Deacidification with Wei T’o® Solutions
at the
Graphic Conservation Department of R.R. Donnelley & Sons Company, Chicago, IL, from 1968 to 1982.


  1. Audubon: Three complete Elephant Folios, 4v. each, hand-colored engravings.
  2. Audubon: Chromolithographs (more rare than Elephant Folios).
  3. Henri Toulouse-Lautrec: Various posters and watercolors.
  4. Francisco Goya: Etchings, some hand-colored.
  5. Ryn Rembrandt: About 30 etchings.
  6. Jean Paul Sartre: 1800 leaf manuscript.
  7. M. Eacher: Approximately 150 woodcuts and lithographs.
  8. Frank Lloyd Wright: Various materials including drawings.
  9. Burnam Plan of Chicago: Watercolor architectural drawings.
  10. Drawings of the Capital: State of Michigan.
  11. Chicago Historical Society: Approximately 30 posters from various periods.
  12. George Washington: Letter of Acceptance of First Presidency of the United States.
  13. U.S. Declaration of Independence: Three copies printed on July 4,1776.
  14. U.S. Constitution: First draft and copies of First and Second Printings.
  15. Abraham Lincoln: Over 2500 letters.
  16. Helen Keller: Approximately 80 hand-written letters.
  17. U.S. Army: Thousands of archival records at Fort Sheridan.
  18. Oliver Cromwell letter.
  19. King Henry VIII letter.
  20. About 30 volumes of 16th, 17th, and 18th century atlases from the American Geographical Society Collection at the Golda Meir Library, University of Wisconsin Milwaukee.
  21. Complete production records for the Winchester rifle from between 1860-1907 including 300 manuscript ledgers and 9,000 leaves of accounting records.
  22. Declaration of Independence of the Sovereign State of Texas.

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