Columbia subject headings:
Maps.
Sea birds--California--Geographical distribution--Maps.
Sea birds--California--Geographical distribution.
Harvard subject headings:
Bird populations--California.
Birds--California--Geographical distribution--Maps.
Birds--California--Geographical distribution.
Birds--Eggs.
Birds--Geographical distribution.
Birds--Nests.
Sea birds--California--Geographical distribution--Maps.
Sea birds--California--Geographical distribution.
Shore birds--California.
Princeton subject headings: