Nebraska - WESTERN LEAGUE.
These guys could be Omaha which was a team in the Western League. Though I can't find a roster which includes Bowerman, he did play for Kansas City in 1911 and appears to have been working the minor leagues.
In Steve's bottom postcard, the guy in the upper right has his jersey partly covered but doesn't it look like this logo?
http://www.nebaseballhistory.com/gi1015.html
From 1910 through 1913, the Grand Island team was a second division squad. In 1914, the team won the Nebraska State League with a 66-46 record. They were 16-16 in 1915 when the league fell apart.
So maybe this is 1916? Year after they disbanded? Or Galveston from the Texas League? Anyway. Maybe too many questions.