Hi folks - Bob was right - the map is at David Rumsey but I never knew it was incomplete. I posted the shots as it was the closest I'd found in date. Nevertheless the collection at David Rumsey is superb. I've got some plate sections from 1879 and 1891 maps but I only took screen grabs relevant to my addresses and I can't see any publisher info on them to pass on. Unfortunately I use a mac and they stopped support for the MrSid viewer which allowed me to download the complete map and convert say into a tiff or jpeg.