On the library's homepage, search the catalog by using the keywords: Theo AND Doesburg. When the record comes up, click on it and take down the call number of the book. It should be shelved in the outside stacks in the 720's just above us. Books on van Doesburg that are owned by other libraries may be requested by clicking on the "Make a Request" link on the right side of the page. You will be asked for your Library barcode number (1119300....).