Permissions: Most of the images in this book are from Wiki Commons or are in the Public Domain. For the rest, I have sought permission to use them from the proper authorities and, in each case, have received permission.
The last four chapters of the book contain the full credits for each photo. In the main body of the book, each photo has a caption that gives a portion, but only a portion, of the full credit.
Captions: I have attempted to use the original captions (as they appear in the original, on-line versions of the images. Where I have been able to do this, I indicate original text by using italics. Any additions I have made to the original text are in square brackets […].