TY  - BOOK
AU  -  Howell,Thomas R.
AU  -  Araya,Braulio
AU  -  Millie,William R.
TI  -  Breeding biology of the gray gull, Larus modestus / 
SN  -  0520095162
U1  -  598.33   22
PY  - 1974///
CY  -  Berkeley : 
PB  -  University of California Press, 
KW  -  Gray gull
KW  -  Sexual behavior
N1  -  Includes bibliographical references (p. 55-57)
ER  -