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Let Us Now Praise Famous Men: Evans' photos
The Library of Congress has the collection of Walker Evans photographs for Let Us Now Praise Famous Men, which includes some photos that were not included in the book. They are organized in two albums that you can page through, here. The albums use the families' actual names: the Burroughs are the Gudgers, the Fields are the Woods, and the Tengles are the Ricketts. The wikipedia entry on Let Us Now Praise Famous Men provides a complete list of who's who. The photos used in the book can be seen here.
The blog Steamboats are ruining everything provides the following additional information:
Most of the photos that Agee glosses are printed in the front of his book, and a few more may be found online in the Library of Congress's two albums. To find still more photos, search the Library of Congress's Prints and Photographs Division for 'Walker Evans Alabama' or for 'Walker Evans' and the name of one of the tenant-farming families ('Burroughs', 'Tingle' [sometimes spelled 'Tengle'], or 'Fields'). Once you do this, click on 'Display Images with Neighboring Call Numbers' if you want to see Walker Evans photos in the Library of Congress that haven't been given titles or otherwise indexed. That's the only way to find this portrait of the children Floyd Lee Burroughs Jr. and Othel Lee Burroughs, this alternate portrait of Floyd Burroughs on his porch or this one of him on a mule, or this enigmatic close-up of one of the Fields children.
Still more images may be found at the Walker Evans Archive of the Metropolitan Museum of Art, where it's easy to compare the stoic close-up portrait of Allie Mae Burroughs (Annie Mae Gudger) that Evans chose to print in Let Us Now Praise Famous Men with her sly smile in two variants. (Here's yet another, from the Library of Congress, which was reproduced in Evans's American Photographs of 1938.) The Met also has a striking image of Floyd Burroughs in profile, which I've never seen anywhere.

