A family living in a Maryland suburb of DC has been collecting photographs of soldiers who served on both sides in the Civil War (or War Between the States). Their name is Liljenquist. Either they donated much of their collection, or they are sharing their collection, but their photographs were on exhibit at the Library of Congress.
The exhibit was held in 2011, to mark the 150th anniversary of the start of the Civil War (or War Between the States). It was The Last Full Measure: Civil War Photographs from the Liljenquist Family Collection.
Here is the LoC site about their collection:
Liljenquist Family Collection of Civil War Photographs
Summary: More than 1,000 special portrait photographs, called ambrotypes and tintypes, represent both Union and Confederate soldiers during the American Civil War (1861-1865). The photographs often show weapons, hats, canteens, musical instruments, painted backdrops, and other details that enhance the research value of the collection. Among the most rare images are sailors, African Americans in uniform, Lincoln campaign buttons, and portraits of soldiers with their families and friends.
Tom Liljenquist and his sons Jason, Brandon, and Christian built this collection in memory of President Abraham Lincoln and the 620,000 Union and Confederate servicemen who died in the American Civil War. For many, these photographs are the last known record we have of who they were and what they looked like. See
"From the Donor's Perspective--The Last Full Measure" for the full story.
The Liljenquist Family began donating their collection to the Library of Congress, Prints & Photographs Division in 2010 and continues to add to it. In addition to the ambrotypes and tintypes, the collection also includes several manuscripts, patriotic envelopes, photographs on paper, and artifacts related to the Civil War.
If you can't find the photograph you're looking for here, it doesn't exist.
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