Maps of Dorchester are available at this link
The Bromley atlases from 1894 through 1933 are consistent in putting the same neighborhood on the same plate. The 1898 atlas has an index plate that will allow you to see which plate number you want for the area you want to look at. The 1874 Hopkins and 1889 Bromley atlas do not follow the same pattern, but those atlases do have their own index plates. For other atlases, you may need to try several plates before finding the one you want.