This project to identify through photographic evidence and mathematical calculations would not be as complete if it were not for the assistance I have received from many people along the way.

I would like to begin by thanking Licensed Battlefield Guide Sue Boardman, who allowed me access to her incredible collection of original battlefield photographs, and has graciously granted me permission to use so many of them on this site. Sue is a trustee of the Adams County Historical Society, and is the author and co-author of several books, including two very popular works on the Gettysburg Cyclorama.

I am grateful to Maria Lynn, Archives Manager of the Adams County Historical Society for guiding me through the process of licensing several images from the ACHS’s image collection for use on this website.

Licensed Battlefield Guide Tim Fulmer graciously permitted me to use an image from his own wonderful website Gettysburg Remembered. Tim also produces fantastic and exceptionally watchable videos on his own YouTube channel, which include great then-and-now videos (see them here, here and here).

Many thanks to Joe Maroney, for allowing me to reproduce one of his postcards on this site. Joe administers a delightful Facebook page, Gettysburg in Postcards.

Thanks to Nathaniel Bauder, National Park Service jack-of-all-trades, who helped with tree species identification.

Several people early on have expressed admiration for the professional layout and sober beauty of this website. That is not my doing! The credit for that goes Stefan Hartman, of York County, PA, who owns Major Designs, a full-service “web design, development and hosting” company. I thank Stefan for his close personal attention and responsiveness, and especially for his ability to turn my abstract notions of what I wanted in a website into a reality!

There are many employees of the National Park Service at Gettysburg National Military Park who have helped, and continue to help, me with this project. Chief among them are Museum Curator Greg Goodell, who went way beyond the call of duty to help me in my research in the park archives, and Ranger John Hoptak, who has been amazingly generous with his time in assisting me with research in the park library.

Ranger Karlton Smith performed research on my behalf to help me select many of the names which I used to name the witness trees on the battlefield. Volunteer Jon Pople also deserves thanks for helping me with research and naming. Rangers John Nicholas and Tom Holbrook helped clarify numerous details regarding the battle itself, and I have used this information on this site.