If you're interested in buying or selling dolls, or finding the value of a doll, use the MEMBER DIRECTORY to find a NADDA dealer in your area and to link to member web sites. Your local library or bookstore is also a good place to find a price guide on antique dolls.
The intent of the standard is to define reasonable lippage from one tile to another. When a tile is warped but within standards, all of the corners cannot be set in the plane of the adjoining tiles. Accordingly, the tolerance for variation from tile to tile includes the actual warpage of the tile.
Dry thinset mortar is cheap, but it is also difficult to mix (so buy pre-mixed mortar). Your tilework is only as good as your substrate or subfloor. If you do not have a good subfloor, your tile will not lie flat. Lippage will occur--adjoining tile edges that are not the same height.