"Five natural hybrid combinations in lampreys (Cyprinidae)" is a scientific work by scientists Frank B. Cross and V. L. Minkley, which investigates the phenomenon of hybridization in the carp family. The authors describe in detail five cases of hybridization of natural origin among lampreys. The book contains research results, classification of hybrids and their morphological features. This scientific work is an important source for studying the evolution and gene pool of carp fish, as well as understanding the natural mechanisms of hybridization in wild populations.