In 1963, Alexander Calder donated a collection of photographs, news-clippings, sketches, correspondence, and other personal documents including a passport and address book to the Smithsonian Institution. The stack of papers measured 2.5 feet tall and was microfilmed shortly after receipt.
This collection has been digitized, and is available for viewing online at the Smithsonian Archives of American Art.
Alexander Calder papers: 1926 - 1967
I spent well over an hour browsing this collection and I highly recommend that you check it out if you are a Calder fan. I especially enjoyed the family photographs and some of the news-clippings that were reviews of various exhibits from early in Calder's career. Many of these are in French...I wish I could read them!