The harbor Richard Dana didn't see.

San Pedro Harbor changed a lot in forty years. A couple of islands disappeared, the biggest barrier island changed its name, and there was a lot of infill.

The people I am most interested in lived near the end of Terminal Island, just east of the breakwater. East San Pedro.

Making a map like this is Hugely Helpful. I now know where things are when I read about them and I have better insights into how things developed. For example I had not noticed until today that the streets in Terminal (the neighborhood near the train station) are only odd numbered. The reason for this is the Terminal Railroad platted a town with streets on both sides of its tracks, and all the even numbers began and ended on the north side. When the LA & SL RR took over ~1900 they scrapped the idea of streets north of the tracks and subleased to a lumber company instead. This caused trouble, and odd numbered streets.