Hello! I saw your message looking for info on Andrew L Kerr. I believe I have a picture of a memorial (possibly a grave?) for someone with this name in California. It says "in Memory of Andrew L Kerr Died Apr 24, 1860 (the last number is broken off- could possibly be 1868) Aged 40 yrs- a native of Scotland- erected by his beloved wife Elizabeth Kerr" This was found in a mountain meadow in Mariposa county, California by myself & friends a few years ago. You are free to write me any time, but other than a couple of pictures, I don't know anything about him. Hope this helps!