Even if you live across the street, it is a good idea to call first and determine whether an appointment is necessary. It is not wise to drop in to an archives in the way you would a library. Large repositories have staff devoted to reference service and usually can accomodate the unscheduled visitor. However, the time available to assess your needs may be limited. The staff of small archives have a variety of responsibilities and may not be able to attend to unannounced researchers. Remember that most archives close occasionally to take inventory. Small agencies also may have to close to accommodate staff leave.