This database contains a list of reference works/books which volunteers are willing to search for specific entries. Despite its name you aren't required to 'exchange' anything and it's free. To ask for a look-up, please click on the volunteer's name next to the item. Requests should be specific: give as much detail as you can. Abuses of the kindness of volunteers may cause them to withdraw their names so please don't ask for all references to a common name, or for time-consuming research. If there are two volunteers against any item then only one should be approached at a time.