The larger ships shown in this image of craft at anchor in Monterey Bay are purse seiners, identified by the tall masts and boom that extends out over the water when deployed.
The description states:
Riding lazily at anchor in the Bay at Monterey, California.
–The smaller boat is more typical of a lobster boat, or perhaps was used for abalone, which was commonly harvested in this time. This card likely dates from the 1950s.