An essential field guide for butterfly enthusiasts, “Butterflies: East of the Great Plains” by Paul A. Opler and George O. Krizek is a landmark publication that has stood the test of time since its first release in 1984. This book is a true masterpiece of scientific and artistic collaboration, offering a detailed and accessible look at the diverse butterfly species found in the eastern half of North America. Its enduring popularity is a testament to its quality and the authors’ deep expertise and passion for their subject.