I saw in the 1850 Federal census that my 3x great grandfather, Abijah Hitchings of Salem, Massachusetts, was a “gum copal worker.” After doing a double take, I wasn’t sure that I even transcribed these words correctly, so I called over three other people to look at the image on my computer monitor. It seemed to be very clear, but some thought perhaps it could be “gun” or other variations on known words. We looked up copal, but it didn’t seem to make sense.
So I turned to the Google Book Search.