Here are some links to a great collection of vintage US Geoglogical Service maps from the University of New Hampshire Library:1893 Bath, E. Albany, Greenbush;
1928 Rensselaer; 1950 Rensselaer
See more Historic USGS Maps of New England & NY from the collection. Rensselaer is in the Troy, NY Quadrangle, "Southwest Corner", and from this page you can easily navigate to adjacent regions.
Last year I bought a reproduction antique map of Poestenkill from Historical Ink as a gift, and I was very happy with the quality. These maps include family names (but in very small type). You can't preview the maps online, but here is the list of their old maps of Rensselaer County towns, reproduced from the Atlas of Rensselaer County, New York, published in 1876 by F. W. Beers. Like the 1893 map above, this predates "Rensselaer, NY", so look for the map of "Bath on the Hudson", and three maps showing "Part of Greenbush" by ward numbers.
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