Trilobites were my first fossil. I remember making them out of dirt using a tablespoon I’d sneaked from my mom’s kitchen. The image of these ancient creatures living through eons of time, placidly munching away, has always fascinated me. There are many books on trilobites, but the one I’ve sought for years is the University of Kansas‘ Treatise on Invertebrate Paleontology, Part O, which covers them in amazing detail. There’s a 1997 update with great photos, but I prefer the 1959 edition with its precise drawings. If you’re a trilobite aficionado, I recommend it.