1859 Directory - Wilmington, DE in the subject line might catch the attention of the person w/the book you are asking a lookup for - but - it won't draw the attention of busy people searching the archives, it won't draw the attention of busy people quickly scanning their mailing lists - AND - it certainly isn't going to quickly catch the eye of fellow researchers of the name you are asking about since there is no indication in the subject line of what that surname of interest is. A better suggestion would be to use: 1859 Directory - SURNAME. Insert the surname you are asking about in place of SURNAME. Use caps for the surname as well, that enables search engines to pick up on the name as well as to emphasize and bring attention to it. Good luck in your searching!