The most intriguing name may be that of the map's creator, J. Lathrop. The Reverend Joseph Lathrop, is said to have written nearly 5,000 sermons over 64 years as West Springfield's minister, the town's third. However, Rev. Lathrop passed in 1820, over a decade before the map's creation. Perhaps we are looking at the handiwork of one of the illustrious minister's descendants. No matter, 'tis a time capsule left for us to open. A present from the past.
This map and many others can be found in the Library of Congress's (LOC) Map Collections digital archive. Here's the link: http://memory.loc.gov/ammem/gmdhtml/gmdhome.html.
Personally, I find that viewing maps on the LOC web site is a bit limiting as far as ease of maneuverability and that it's also difficult to save large chunks of the images for later offline perusal. The best method I've found so far for getting the most out of these (mostly) public domain maps is to download them - they come in either JPEG2000 or MrSID formats - and use the free program, Irfanview (with plug-ins), to open, resize and convert them to other file formats, such as the JPEG up above. The LOC maps are usually large files, it takes a bit to download them, and one has to be patient with Irfanview as it loads the image.
As always, thanks for stopping by and take care.
Map source: Library of Congress, Geography and Map Division, Digital ID: http://hdl.loc.gov/loc.gmd/g3764w.la002013