We would like to emphasize that little effort is made to interpret the images and establish the historical authenticity or accuracy of what they display. To accomplish this would constitute a major and different research effort. Individual users of this collection must decide such issues for themselves. However, we have made every effort to ensure bibliographic accuracy and the correct identification of both primary and secondary sources from which the images have been obtained, as well as correct identification of the area, country, or region to which the image refers. The dates we assign may refer to the date an image was published, at other times to when an author visited an area; in other cases, we could only assign a general time period. Despite our efforts at bibliographical and chronological accuracy, errors remain, and we welcome any comments, suggestions, or corrections.