NOTED CENTRES OF PRODUCTION 



13 



Fig. 9. — A large laying flock, Petaluma, Cal., with characteristic portable laying houses. 



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Fig. 10. — A large breeding flock at a commercial hatchery, Petaluma, Cal. 



Photos by courtesy of The Petaluma Board of Trade. 



Fig. 11. — Interior of a commercial hatchery, Petaluma, Cal. 



