Paul, that first yellow flower is a wildflower called Butter-and-eggs or Toadflax, belonging to the Snapdragon Family. The last yellow flower is another wildflower called Common Tansy. It's a member of the Daisy Family.

When I first moved here "out in the boonies" I picked up a neat book, Peterson's First Guide to Wildflowers for $4.95. Sadly I believe it's out of print and only the larger version available. I find that the little version is just great as all the flowers are arranged by color and the leaves are shown also, which makes for easy identification. Now I'm able to follow the growing season from beginning to end. I've already seen some goldenrod so that means we're coming near to the end of the season again.

Thanks for the flowers and the rest of your photos aren't half bad either!