All of his unpublished musical manuscripts were eventually microfilmed. For many years, the work was unpublished and apparently unperformed, surviving only in manuscript. Much of this work was unpublished, but manuscripts and copies circulated among friends and admirers. Dyck's photographs remain the basis for the modern editions of Kepler's unpublished manuscripts. Drafts of his published works and unpublished works are part of the collection. Unmodernized, critical editions of George Santayana's published and unpublished writing. This protection is available to both published and unpublished works. "" (1990), a collection of autobiographical reminiscences, articles and previously unpublished material. For example, published v unpublished, or confidential v non-confidential works. The book contains a number of previously unpublished photographs of Chick. Philip Raleigh championed his grandfather's cause, publishing several of his hitherto unpublished papers. Grove City College houses the 20,000-page archive of Mises papers and unpublished works. The novel remained unpublished during his lifetime. Additional novels were planned by Carey which remain unpublished. Attempts to identify unpublished studies often prove difficult or are unsatisfactory.