Poincaré's unpublished manuscripts : Calendar
Henri Poincaré's Nachlass includes dozens of manuscripts, including reports, research notes, course notes, calculations, and drafts of scientific papers.
The search engine on the left lets you search for a manuscript in two modes: simple or complex. Alternatively, you can scroll through the entire list, ordered chronologically. The query result set will usually offer links to transcriptions and/or scans of manuscripts. For a pop-up display of metadata for each manuscript in the result set, click on "Metadata".
If you wish to match a term in "full text" mode, then type your query in the upper right-hand text box.