Farber Collection, especially in cases like the Polly Howard stone where the epitaph is not fully visible in the Farber photo.
Unfortunately, Brockton, MA has several 18th-c graveyards and I have been unable to find this stone in any of them. It is possible that it is no longer standing. I haven't yet checked every cemetery in Brockton, so I am not without hope that I will find it someday. If I do, I'll update this post.
Polly Howard's stone characterizes the little girl as a gift given and recalled by heaven:
The daughter of Mr. Danl.
& Mrs. Vesta Howard.
A Boon received Jany. 25
1778. Remanded by the . . .