SAMPLERS: HOW TO COMPARE AND VALUE by Stephen & Carol Huber
This almost 200-page, hardcover book was published in 2002 and is a wealth of information about what to look for when collecting samplers. Even if you don't buy samplers, there is still a lot to learn in how samplers are designed, what samplers look like from different parts of the world, and why some elements make a sampler more valuable than others. LOTS of pictures in full-color, and a great reference. This is one of my favorites! I get these in used, since they are long out of print. Condition will vary.