TY  - BOOK
AU  - Hanson,Earl D
TI  - The origin and early evolution of animals
SN  - 0819550086
PY  - 1977///
CY  - Middletown, Conn.
PB  - Wesleyan University Press
KW  - Evolution
N1  - Includes indexes; Bibliography: p. 594-637
ER  -