A good color reproduction of Booth's map is available from the University of Michigan here.
My favorite spot when in London is Half Moon Street, just north of Green Park, next door to Buckingham Palace. Shockingly the Queen has not invited me to come over for tea. Not exactly a neighborhood of poverty in those days or these.
A very pretty large scale version of a segment of the map is here.
You can also see and download several of Booth's volumes at Google Books. Here is one.
Here are two of Booth's earliest reports presented to the Royal Statistical Society. (These are at JSTOR so you will need access to link to the articles.) Article 1 and Article 2
A slightly later address by Booth to the Royal Statistical Society is here. (Also JSTOR.)