The website thisoldtoy.com (TOT) has a great collection of Precious Places photos, but is missing some pictures of key lithos, one of them being the Sunshine Country Picnic key litho.
Here is what I believe to be the key litho for the Picnic set:
I'm pretty sure it is the right key since it has a basket on the litho and because I don't know of another set to which it might belong.
Anyone want to confirm or dispute this claim? Please let me know!