There are three separate photos numbered 51; the second and third versions were taken on days when the streets were dry.
The third version, using the same negative as Image 131, features a sign for McCarthy Dry Goods over the street. The spot near the center is due to a photographic printing problem.
The perspective is almost identical for all three images.
"2 Ave." is presumably shorthand for "2nd Avenue."
The "wet streets" version was also reprinted by M.L. Zercher Book and Stationery Co. in Topeka, Kansas. We do not know if it was authorized.