Yellow flower

Hi,
I found these yellow flowers in the Black Dog park outside Minneapolis / Minnesota a few weeks ago. Any ideas what they are?

Thanks,
// Magnus;

 

Helianthus sp.

 

Maybe Helianthus sp. Maybe Rudbeckia sp. Picture not detailed enough for precise ID. Go to your local library and look it up in a guide to the Minnesota flora or try to key it out in the latest edition of Fernald.

 

Poster is in Sweden. I also think it is a sunflower. Possibly internet resources on Minnesota plants will have same one shown or at least described.

 

Thanks, I really appreciate the input!

Added two more images...

Thanks for all help,
// Magnus;